Genesis 21:8-10 ▼

8 The child [Isaac] grew and was weaned, and Abraham held a great feast on the day that Isaac was weaned.

9 Now [as time went on] Sarah saw [Ishmael] the son of Hagar the Egyptian, whom she had borne to Abraham, mocking [Isaac].

10 Therefore she said to Abraham, “Drive out this maid and her son, for the son of this maid shall not be an heir with my son Isaac.”