Gen 22:17-18, Gen 26:4, Gal 3:16, Mt 2:4-6

In the Old Testament, David told the Israelites to remember Christ, the eternal covenant God gave to Abraham, Isaac, and Jacob. (1 Chronicles 16:15-18)

1 Chronicles 16:15 Be ye mindful always of his covenant; the word which he commanded to a thousand generations; 16 Even of the covenant which he made with Abraham, and of his oath unto Isaac; 17 And hath confirmed the same to Jacob for a law, and to Israel for an everlasting covenant, 18 Saying, Unto thee will I give the land of Canaan, the lot of your inheritance;

God told Abraham, Isaac, and Jacob that he would send Christ as their descendant, and that through him all peoples of the world would be blessed. (Ge 22:17-18, Gen 26:4)

Gen 22:17 That in blessing I will bless thee, and in multiplying I will multiply thy seed as the stars of the heaven, and as the sand which is upon the sea shore; and thy seed shall possess the gate of his enemies; 18 And in thy seed shall all the nations of the earth be blessed; because thou hast obeyed my voice.

Gen 26:4 And I will make thy seed to multiply as the stars of heaven, and will give unto thy seed all these countries; and in thy seed shall all the nations of the earth be blessed;

The descendant God promised to Abraham and his descendants in the Old Testament is Christ. (Gal 3:16)

Gal 3:16 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.

As prophesied in the Old Testament, Christ was born in Bethlehem, Judea. That Christ is Jesus. (Mt 2:4-6, Mt 1:16)

Mt 2:4 And when he had gathered all the chief priests and scribes of the people together, he demanded of them where Christ should be born. 5 And they said unto him, In Bethlehem of Judaea: for thus it is written by the prophet, 6 And thou Bethlehem, in the land of Juda, art not the least among the princes of Juda: for out of thee shall come a Governor, that shall rule my people Israel.

Mt 1:16 And Jacob begat Joseph the husband of Mary, of whom was born Jesus, who is called Christ.