Genesis 21:11-15

The matter distressed Abraham greatly because of his son Ishmael.

But God said to Abraham, “Do not be distressed because of the boy and your slave woman; whatever Sarah tells you, listen to her, for through Isaac your descendants shall be named.

And of the son of the slave woman I will make a nation also, because he is your descendant.”

So Abraham got up early in the morning and took bread and a skin of water, and gave them to Hagar, putting them on her shoulder, and gave her the boy, and sent her away. And she departed and wandered about in the wilderness of Beersheba.

When the water in the skin was used up, she left the boy under one of the bushes.