4. Eight days after Isaac was born, Abraham circumcised him as God had commanded.
5. Abraham was 100 years old when Isaac was born.
6. And Sarah declared, “God has brought me laughter. All who hear about this will laugh with me.
7. Who would have said to Abraham that Sarah would nurse a baby? Yet I have given Abraham a son in his old age!”
8. When Isaac grew up and was about to be weaned, Abraham prepared a huge feast to celebrate the occasion.
9. But Sarah saw Ishmael—the son of Abraham and her Egyptian servant Hagar—making fun of her son, Isaac.
10. So she turned to Abraham and demanded, “Get rid of that slave woman and her son. He is not going to share the inheritance with my son, Isaac. I won’t have it!”
11. This upset Abraham very much because Ishmael was his son.
12. But God told Abraham, “Do not be upset over the boy and your servant. Do whatever Sarah tells you, for Isaac is the son through whom your descendants will be counted.
13. But I will also make a nation of the descendants of Hagar’s son because he is your son, too.”
14. So Abraham got up early the next morning, prepared food and a container of water, and strapped them on Hagar’s shoulders. Then he sent her away with their son, and she wandered aimlessly in the wilderness of Beersheba.