Genesis 21:10

21:10 So she said to Abraham, “Banish ¹  that slave woman and her son, for the son of that slave woman will not be an heir along with my son Isaac!”

Genesis 21:13

21:13 But I will also make the son of the slave wife into a great nation, for he is your descendant too.”

[21:10]  ¹ tn Heb “drive out.” The language may seem severe, but Sarah’s maternal instincts sensed a real danger in that Ishmael was not treating Isaac with the proper respect.