New King James Version (NKJV)
Genesis 16
15 So Hagar bore Abram a son; and Abram named his son, whom Hagar bore, Ishmael.
16 Abram was eighty-six years old when Hagar bore Ishmael to Abram.
Genesis 17
1 When Abram was ninety-nine years old, the Lord appeared to Abram and said to him, "I am Almighty God; walk before Me and be blameless.
2 And I will make My covenant between Me and you, and will multiply you exceedingly."
3 Then Abram fell on his face, and God talked with him, saying:
4 "As for Me, behold, My covenant is with you, and you shall be a father of many nations.
5 No longer shall your name be called Abram, but your name shall be Abraham; for I have made you a father of many nations.
6 I will make you exceedingly fruitful; and I will make nations of you, and kings shall come from you.
7 And I will establish My covenant between Me and you and your descendants after you in their generations, for an everlasting covenant, to be God to you and your descendants after you.
8 Also I give to you and your descendants after you the land in which you are a stranger, all the land of Canaan, as an everlasting possession; and I will be their God."
9 And God said to Abraham: "As for you, you shall keep My covenant, you and your descendants after you throughout their generations.