Genesis 17:1-7, 15-16

When Abram was ninety-nine years old, the LORD appeared to him and said, “I am God Almighty; Walk [habitually] before Me [with integrity, knowing that you are always in My presence], and be blameless and complete [in obedience to Me]. “I will establish My covenant (everlasting promise) between Me and you, And I will multiply you exceedingly [through your descendants].” Then Abram fell on his face [in worship], and God spoke with him, saying, “As for Me, behold, My covenant is with you, And [as a result] you shall be the father of many nations. “No longer shall your name be Abram (exalted father), But your name shall be Abraham (father of a multitude); For I will make you the father of many nations. I will make you exceedingly fruitful, and I will make nations of you, and kings will come from you. I will establish My covenant between Me and you and your descendants after you throughout their generations for an everlasting covenant, to be God to you and to your descendants after you. [Gal 3:16]

Then God said to Abraham, “As for Sarai your wife, you shall not call her name Sarai (my princess), but her name will be Sarah (Princess). I will bless her, and indeed I will also give you a son by her. Yes, I will bless her, and she shall be a mother of nations; kings of peoples will come from her.”