Genesis 21:6-10

Sarah said, “God has brought me laughter, and everyone who hears about this will laugh with me.” And she added, “Who would ever have told Abraham that Sarah would one day nurse children! Even though Abraham is an old man, look—I have given him a son!” Isaac grew and was weaned; and on the day Sarah weaned him, Abraham prepared a great feast. But Sarah noticed the son of Hagar, the Egyptian, was mocking her son Isaac. So she said to Abraham, “Get rid of this slave woman and her son. Banish them, for the son of that slave woman must not become a coheir with my son Isaac!”