Genesis 21:8בראשית כ״א:ח׳
And the child grew, and was weaned: and Avraham made a great feast on the same day that Yiżĥaq was weaned.
Genesis 21:10בראשית כ״א:י׳
So she said to Avraham, Cast out this bondwoman and her son: for the son of this bondwoman shall not be heir with my son, with Yiżĥaq.
Genesis 21:17בראשית כ״א:י״ז
And God heard the voice of the lad; and the angel of God called to Hagar out of heaven, and said to her, What ails thee, Hagar? fear not; for God has heard the voice of the lad where he is.