14 The LORD said to Abram after Lot had parted from him, “Lift up your eyes from where you are and look north and south, east and west. 15 All the land that you see I will give to you and your offspring forever. 16 I will make your offspring like the dust of the earth, so that if anyone could count the dust, then your offspring could be counted. 17 Go, walk through the length and breadth of the land, for I am giving it to you.”
18 So Abram moved his tents and went to live near the great trees of Mamre at Hebron, where he built an altar to the LORD. (Genesis 13:14-18)

17 When Abram was ninety-nine years old, the LORD appeared to him and said, “I am God Almighty; walk before me and be blameless. 2 I will confirm my covenant between me and you and will greatly increase your numbers.”
3 Abram fell facedown, and God said to him, 4 “As for me, this is my covenant with you: You will be the father of many nations. 5 No longer will you be called Abram; your name will be Abraham, for I have made you a father of many nations. 6 I will make you very fruitful; I will make nations of you, and kings will come from you. 7 I will establish my covenant as an everlasting covenant between me and you and your descendants after you for the generations to come, to be your God and the God of your descendants after you. 8 The whole land of Canaan, where you are now an alien, I will give as an everlasting possession to you and your descendants after you; and I will be their God.”
9 Then God said to Abraham, “As for you, you must keep my covenant, you and your descendants after you for the generations to come. 10 This is my covenant with you and your descendants after you, the covenant you are to keep: Every male among you shall be circumcised. 11 You are to undergo circumcision, and it will be the sign of the covenant between me and you. 12 For the generations to come every male among you who is eight days old must be circumcised, including those born in your household or bought with money from a foreigner—those who are not your offspring. 13 Whether born in your household or bought with your money, they must be circumcised. My covenant in your flesh is to be an everlasting covenant. 14 Any uncircumcised male, who has not been circumcised in the flesh, will be cut off from his people; he has broken my covenant.” (Genesis 17:1-14)

15 The angel of the LORD called to Abraham from heaven a second time 16 and said, “I swear by myself, declares the LORD, that because you have done this and have not withheld your son, your only son, 17 I will surely bless you and make your descendants as numerous as the stars in the sky and as the sand on the seashore. Your descendants will take possession of the cities of their enemies, 18 and through your offspring all nations on earth will be blessed, because you have obeyed me.”
19 Then Abraham returned to his servants, and they set off together for Beersheba. And Abraham stayed in Beersheba. (Genesis 22:15-18)