You have the wrong quoted verse.Whatever at any point in time you think Jesus IS… a human man or God…Jesus is the Same He always was.
Heb 10:
[8] Jesus Christ the same yesterday, and to day, and for ever.
(Heb 13:7) Remember those that had the rule over you, those who spoke to you the word of God. Consider the outcome of their life, and imitate their faith.
(Heb 13:8) Jesus Christ is the same yesterday and today and for ever.
(Heb 13:9) Do not be carried away by various and strange teachings. For it is good that the heart be established by grace- not with food laws, which have not profited those who have been so occupied with them.
So what does verse 8 mean? I expect it's not what you think it means.
Here's an extended Biblical view of the verse Taken, with a bias on 'yesterday.'
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These verses (7-9) are focused on the gospel of Christ and what he did for us. Verse 8 is not about a pre-existence, existence or the future existence of Jesus/Yahshua. It is about his teaching that never changes over time. We are to remember his words and not to be derailed by false witnesses and teachers, especially after he ascended to heaven.
Its meaning is all about Jesus, what he did and said to others and especially to us. He and his profile, his relationship with his Father and thus his teachings never changes, then, today and tomorrow. Verse 7 warned us not to imitate the leaders, verse 9 says don't go following other ways and strange doctrines that is not Jesus or not about the real Jesus and his teachings.
Although some people try to use this verse as if it says Jesus Christ has existed from eternity past, the very wording shows clearly that is not the case.
A study of the word 'Yesterday' in Scripture shows that it refers to something that happened only a short time before. It would create new grammatic boundaries beyond its intended use, beyond acceptable limits to try to make this verse say that Christ has always existed.
The word transliterated from the Greek is 'echthes' (or 'chthes'), and it appears only three times in the New Testament: John 4:52, Acts 7:28, and Hebrews 13:8. In the first two occurrences, the word is clearly used to mean, the day before today:
John 4:52 (NASB) So he inquired of them the hour when he began to get better. Then they said to him, “Yesterday at the seventh hour the fever left him.”
Acts 7:28-29 (NASB) ‘You do not mean to kill me as you killed the Egyptian yesterday, do you?’ 29 “At this remark, Moses fled and became an alien in the land of Midian, where he became the father of two sons.
Strong’s Concordance defines 'echthes' as: yesterday; by extension in time past or hitherto (until now).
Thayer’s Greek Lexicon defines it as: of time just past.
The Complete Word Dictionary of the New Testament says 'echthes' is an adverb of time; yesterday; also refers to past or former time.
The word 'echthes' is used twice in the Septuagint, the Greek translation of the OT. In both places, it is used to signify a non-specific length of time in the past that could still be recalled by those in the present (generation):
Genesis 31:2 (NASB) Jacob saw the attitude of Laban, and behold, it was not friendly toward him as formerly.
2 Samuel 3:17 (NASB) Now Abner had consultation with the elders of Israel, saying, “In times past you were seeking for David to be king over you.” (emphasis added)
Based on its usage in the New Testament and the Septuagint, yesterday ('echthes') is never used to denote time before time or time long ago. To then say that 'Yesterday' in Hebrews 13:8 refers to Jesus’ supposed eternality would be very inconsistent with its definition and scriptural usage.
John Calvin, although a Trinitarian, understood that the text under review was not a proof for Jesus’ theoretical pre-existence. Rather, the reformer understood it to refer to the knowledge of Christ: He said....
'It hence appears that the Apostle is not speaking of the eternal existence of Christ, but of that knowledge of him, which was possessed by the godly in all ages, and was the perpetual foundation of the Church. '
Thomas Constable, in his expository notes of the Bible, offered his understanding of the text of Hebrews 13:8:
Jesus Christ is the content of the message that the leaders had preached to these hearers (see Hebrews 13:7). That message and its hero is what this writer had urged his readers not to abandon. The leaders had preached the Word of God to these readers, and that preaching culminated in Jesus Christ.
It is about the truth of Jesus's doctrines that never changes over time and spoke of them. Don't go following strange doctrines and gods like a pre-existent or incarnated Yahshua for example. It never happened.
The first word in verse 7. ‘remember’ gives us the connection with the word ‘yesterday’ used in verse 8. The word ‘remember’ is linked to the word yesterday! Remember the past when the gospel was preached to you!
This sets the time of what ‘yesterday’ means. Yesterday is the time when Jesus came to deliver the gospel of God to men. This gospel concerning Jesus as our Lord and Savior has not changed since that time, today and into the next age(s), because Jesus has not changed over time.