Genesis 21:8-14

Isaac grew, and when he became old enough to eat food, Abraham gave a great feast. But Sarah saw Ishmael making fun of Isaac. (Ishmael was the son of Abraham by Hagar, Sarah’s Egyptian slave.) So Sarah said to Abraham, “Throw out this slave woman and her son. Her son should not inherit anything; my son Isaac should receive it all.” This troubled Abraham very much because Ishmael was also his son. But God said to Abraham, “Don’t be troubled about the boy and the slave woman. Do whatever Sarah tells you. The descendants I promised you will be from Isaac. I will also make the descendants of Ishmael into a great nation because he is your son, too.” Early the next morning Abraham took some food and a leather bag full of water. He gave them to Hagar and sent her away. Carrying these things and her son, Hagar went and wandered in the desert of Beersheba.