ISAAC’S BIRTH PROMISED BY GOD

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.

SARAI AND HAGAR ABRAM’S SON ISHMAEL

So Sarai said to Abram, “See here, the LORD has prevented me from bearing children. I am asking you to go in to [the bed of] my maid [so that she may bear you a child]; perhaps I will obtain children by her.” And Abram listened to Sarai and did as she said.
After Abram had lived in the land of Canaan ten years, Abram’s wife Sarai took Hagar the Egyptian [maid], and gave her to her husband Abram to be his [secondary] wife

THE GENERATIONS UNTIL ABRAM

The Generations Until Abram. Terah took Abram his son, and Lot the son of Haran, his grandson, and Sarai his daughter-in-law, his son Abram’s wife; and they went out together to go from Ur of the Chaldeans into the land of Canaan; but when they came to Haran [about five hundred and fifty miles northwest of Ur], they settled there.