In Genesis 22, YHWH, by His own sovereign will, swore (shaba) an oath (shabuw’ah) with Abraham that he would bless Abraham and that this blessing would include, in part, that through Abraham’s seed all nations of the earth would be blessed. A couple of verses help illustrate this promised seed and His purpose. The apostle Paul describes the “seed” in this way:
Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. (Galatians 3:16)
The author of Hebrews describes Yeshua as the seed of Abraham who sent to make reconciliation for the sins of the people.
For verily he [Yeshua] took not on him the nature of angels; but he took on him the seed of Abraham. Wherefore in all things it behoved him to be made like unto his brethren, that he might be a merciful and faithful high priest in things pertaining to God, to make reconciliation for the sins of the people. Hebrews 2:16-17
After the birth of John, Zachariah his father prophesied about the coming messiah. He describes this coming “mercy” and the “holy covenant” as the oath Yahweh swore with Abraham.
Blessed be the Lord God of Israel; for he hath visited and redeemed his people, And hath raised up an horn of salvation for us in the house of his servant David;
As he spake by the mouth of his holy prophets, which have been since the world began: That we should be saved from our enemies, and from the hand of all that hate us;
To perform the mercy promised to our fathers, and to remember his holy covenant; The oath which he sware to our father Abraham,.. (Luke 1:68-73)
Finally the apostle Peter explains to his Jewish brethren that Yeshua was the fulfillment of this covenant made with Abraham.
Ye are the children of the prophets, and of the covenant which God made with our fathers, saying unto Abraham, And in thy seed shall all the kindreds of the earth be blessed. Unto you first God, having raised up his Son Jesus, sent him to bless you, in turning away every one of you from his iniquities. (Acts 3:25-26)