By orthodox I mean conforming to established doctrine as held in the history of the church. By a preterist who is orthodox, I refer to one who believes Matt. 24:1-35 is a prediction of 70 AD and the end of the Jewish religion, and that Revelation was written prior to 70 AD, and in history these were considered within orthodox Christianity. Revelation chapter 20 refers to the general resurrection in our future. I am an Orthodox Preterist, and I believe THE LAST DAY, THE DAY OF JUDGMENT AND RESURRECTION IS IN OUR FUTURE. I am comfortable fellowshipping with those within orthodoxy who hold to historic pre-mil, a-mil and post-mil views, but NOT dispensationalism. I can fellowship with those who view Revelation as preterist, historist or futurist, but NOT the dispensational futurist which is not orthodox Christianity.
By heretical I mean unorthodox, a religious opinion that is a departure from and contrary to historic Christian doctrine as found among the writers of the church in history. I can show the Orthodox Preterist view in the church of the past. Dispensationalism cannot show their scheme prior to 1830 or so, and it's mainly found after the 1920s and the fundamentalist movement with its Scofield Bible.
Adam Clarke (1760-1832) Introduction to Revelation:
"Wetstein contends (and he is supported by very great men among the ancients and moderns) that "the book of the Revelation was written before the Jewish war, and the civil wars in Italy; that the important events which took place at that time, the greatest that ever happened since the foundation of the world, were worth enough of the Divine notice, as the affairs of his Church were so intimately connected with them; that his method of exposition proves the whole book to be a well-connected, certain series of events; but the common method of interpretation, founded on the hypothesis that the book was written after the destruction of Jerusalem, is utterly destitute of certainty, and leaves every commentator to the luxuriance of his own fancy, as is sufficiently evident from what has been done already on this book..."
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Joseph Benson (1749-1821) on Matt. 24:34:
"For he adds, This generation shall not pass till all these things be fulfilled, Hereby evidently showing that he had been speaking all this while only of the calamities coming on the Jews, and the destruction of Jerusalem. “It is to me a wonder,” says Bishop Newton, “how any man can refer part of the foregoing discourse to the destruction of Jerusalem, and part to the end of the world, or any other distant event, when it is said so positively here in the conclusion, All these things shall be fulfilled in this generation."
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By the above it is clear that the Orthodox Preterist understanding of Matthew 24 and the book of Revelation was clearly within the bounds of orthodoxy. The book of Revelation has historical been understood as preterist, historicist or futurist. All have been within orthodoxy. In the history of the church, historic premillennial, amillennial and postmillennial understanding have been considered within the bounds of orthodoxy. What IS NOT found before the mid-19th century is the modern heresy of dispensationalism. What is the difference between orthodox premillennialism and heretical dispensationalist premillennialism? The dispensational heresies are as follows:
1. Separating the church and Israel as two different people of God. For one thing, "church" is an ecclesiastical word not found in the Hebrew or Greek of the Bible. In both the OT and NT, God's people are referred to as the assembly of God or the congregation of God. Some translations prior to the KJV do not contain the word "church". You see this explained in the "Translators to the Readers" foreward found in the original KJV.
2. Introducing sacrifices into the supposed 1000-year reign of Christ(Eze 43:18-19), but Jesus is there in their midst, it can't be explained away as a memorial! That is blasphemy when compared to "But when Christ had offered for all time a single sacrifice for sins, 'he sat down at the right hand of God,'” (Heb 10:12 NRSV)
3. The historic premillennialist believed in two resurrections, one before and one after the millennium. Dispensationalists come up with at least three, one coming at the end of their supposed 7-year tribulation for those saved during those 7 years.
4. The dispensationalist misuse the term "rapture" with a completely different meaning than historically in the church. The rapture as in the "left behind" farce is totally foreign to the Bible. Two resurrections 7 years apart can hardly be both included as a "first resurrection", as claimed by dispensationalists. When you read men of God out of the past refer to the resurrection on "the last day", they refer to that as a "rapture", but that is not what dispensationalist think of as the rapture.
5. Dispensationalism perverts the KJV translation of a dispensation into something foreign to the Bible. The Greek the KJV translates as dispensation is οἰκονομία oikonomia, which means "administration" and the word actually occurs 7 times in the KJV NT and four are in Paul where the KJV translates as dispensation: 1 Cor. 9:17; Eph. 1:10; 3:2; Col 1:25. There is NO justification to invent 7 dispensations as if found in the Bible. There is the dispensation of the gospel and the prior dispensation of law. The "dispensation of law" would be implied by the contrast between law and gospel.
6. Dispensationalists deny that the body of Christ, the New Covenant assembly of God is the fulfillment of and continuation of Old Covenant Israel, as indicated in:
"Circumcision is nothing; uncircumcision is nothing; the only thing that counts is new creation! All who take this principle for their guide, peace and mercy be upon them, the Israel of God!" (Gal 6:15-16 REB)
Who is Israel today? Those who are the "new creation" as in "For anyone united to Christ, there is a new creation: the old order has gone; a new order has already begun." (2Cor 5:17 REB) We who are born from above, New Covenant believers in Jesus Christ, make up the Israel of today.
By heretical I mean unorthodox, a religious opinion that is a departure from and contrary to historic Christian doctrine as found among the writers of the church in history. I can show the Orthodox Preterist view in the church of the past. Dispensationalism cannot show their scheme prior to 1830 or so, and it's mainly found after the 1920s and the fundamentalist movement with its Scofield Bible.
Adam Clarke (1760-1832) Introduction to Revelation:
"Wetstein contends (and he is supported by very great men among the ancients and moderns) that "the book of the Revelation was written before the Jewish war, and the civil wars in Italy; that the important events which took place at that time, the greatest that ever happened since the foundation of the world, were worth enough of the Divine notice, as the affairs of his Church were so intimately connected with them; that his method of exposition proves the whole book to be a well-connected, certain series of events; but the common method of interpretation, founded on the hypothesis that the book was written after the destruction of Jerusalem, is utterly destitute of certainty, and leaves every commentator to the luxuriance of his own fancy, as is sufficiently evident from what has been done already on this book..."
Chapters Available - Revelation - Clarke's Commentary - Bible Commentaries - StudyLight.org
Choose from the available chapters in the 'Revelation' of the 'Clarke's Commentary' commentary FREELY provided by StudyLight.org to help as you prepare sermons, Bible studies, Sunday School lessons or personal devotions.

Joseph Benson (1749-1821) on Matt. 24:34:
"For he adds, This generation shall not pass till all these things be fulfilled, Hereby evidently showing that he had been speaking all this while only of the calamities coming on the Jews, and the destruction of Jerusalem. “It is to me a wonder,” says Bishop Newton, “how any man can refer part of the foregoing discourse to the destruction of Jerusalem, and part to the end of the world, or any other distant event, when it is said so positively here in the conclusion, All these things shall be fulfilled in this generation."
Matthew 24 - Benson's Commentary of the Old and New Testaments - Bible Commentaries - StudyLight.org
Matthew 24, Benson's Commentary of the Old and New Testaments, Benson's Commentary enriches Christian understanding through meticulous historical analysis, providing profound insights into Scripture.

By the above it is clear that the Orthodox Preterist understanding of Matthew 24 and the book of Revelation was clearly within the bounds of orthodoxy. The book of Revelation has historical been understood as preterist, historicist or futurist. All have been within orthodoxy. In the history of the church, historic premillennial, amillennial and postmillennial understanding have been considered within the bounds of orthodoxy. What IS NOT found before the mid-19th century is the modern heresy of dispensationalism. What is the difference between orthodox premillennialism and heretical dispensationalist premillennialism? The dispensational heresies are as follows:
1. Separating the church and Israel as two different people of God. For one thing, "church" is an ecclesiastical word not found in the Hebrew or Greek of the Bible. In both the OT and NT, God's people are referred to as the assembly of God or the congregation of God. Some translations prior to the KJV do not contain the word "church". You see this explained in the "Translators to the Readers" foreward found in the original KJV.
2. Introducing sacrifices into the supposed 1000-year reign of Christ(Eze 43:18-19), but Jesus is there in their midst, it can't be explained away as a memorial! That is blasphemy when compared to "But when Christ had offered for all time a single sacrifice for sins, 'he sat down at the right hand of God,'” (Heb 10:12 NRSV)
3. The historic premillennialist believed in two resurrections, one before and one after the millennium. Dispensationalists come up with at least three, one coming at the end of their supposed 7-year tribulation for those saved during those 7 years.
4. The dispensationalist misuse the term "rapture" with a completely different meaning than historically in the church. The rapture as in the "left behind" farce is totally foreign to the Bible. Two resurrections 7 years apart can hardly be both included as a "first resurrection", as claimed by dispensationalists. When you read men of God out of the past refer to the resurrection on "the last day", they refer to that as a "rapture", but that is not what dispensationalist think of as the rapture.
5. Dispensationalism perverts the KJV translation of a dispensation into something foreign to the Bible. The Greek the KJV translates as dispensation is οἰκονομία oikonomia, which means "administration" and the word actually occurs 7 times in the KJV NT and four are in Paul where the KJV translates as dispensation: 1 Cor. 9:17; Eph. 1:10; 3:2; Col 1:25. There is NO justification to invent 7 dispensations as if found in the Bible. There is the dispensation of the gospel and the prior dispensation of law. The "dispensation of law" would be implied by the contrast between law and gospel.
6. Dispensationalists deny that the body of Christ, the New Covenant assembly of God is the fulfillment of and continuation of Old Covenant Israel, as indicated in:
"Circumcision is nothing; uncircumcision is nothing; the only thing that counts is new creation! All who take this principle for their guide, peace and mercy be upon them, the Israel of God!" (Gal 6:15-16 REB)
Who is Israel today? Those who are the "new creation" as in "For anyone united to Christ, there is a new creation: the old order has gone; a new order has already begun." (2Cor 5:17 REB) We who are born from above, New Covenant believers in Jesus Christ, make up the Israel of today.