God said to Avraham, *Don't let it be grievous in your sight because of the boy, and because of your handmaid. In all that Sarah says to you, listen to her voice. For from Yitzchak will your seed be called.
Bring forth therefore fruits worthy of repentance, and don't begin to say among yourselves, 'We have Avraham for our father;' for I tell you that God is able to raise up children to Avraham from these stones!