There is nothing which somehow negates God's promises to those who are faithful and obedient to Him.
Genesis 15:12-21
(12) And when the sun was going down, a deep sleep fell upon Abram; and, lo, an horror of great darkness fell upon him.
(13) And he said unto Abram, Know of a surety that thy seed shall be a stranger in a land that is not theirs, and shall serve them; and they shall afflict them four hundred years;
(14) And also that nation, whom they shall serve, will I judge: and afterward shall they come out with great substance.
(15) And thou shalt go to thy fathers in peace; thou shalt be buried in a good old age.
(16) But in the fourth generation they shall come hither again: for the iniquity of the Amorites is not yet full.
(17) And it came to pass, that, when the sun went down, and it was dark, behold a smoking furnace, and a burning lamp that passed between those pieces.
(18) In the same day the LORD made a covenant with Abram, saying, Unto thy seed have I given this land, from the river of Egypt unto the great river, the river Euphrates:
(19) The Kenites, and the Kenizzites, and the Kadmonites,
(20) And the Hittites, and the Perizzites, and the Rephaims,
(21) And the Amorites, and the Canaanites, and the Girgashites, and the Jebusites.
This tells us of God giving the land to Abram and his seed, his descendants. This is a material possession for an ethnic people group in a unilateral covenant. There was nothing required from Abram to satisfy this covenant. God required of Himself to give to Abram the land. This is the same land that will be divided to the tribes again, after Jesus returns.
Jesus prophesied the kingdom that would come,
Matthew 19:27-28
(27) Then answered Peter and said unto him, Behold, we have forsaken all, and followed thee; what shall we have therefore?
(28) And Jesus said unto them, Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also shall sit upon twelve thrones, judging the twelve tribes of Israel.
This too will come to pass.
Much love!