But God said to Abraham, “Do not be upset concerning the boy and your slave wife. Whatever Sarah has said to you, listen to what she says, for in Isaac your descendants will be called.
and do not think to say within yourselves, ‘We have Abraham as our father,’ for I say to you that God is able from these stones to raise up children for Abraham.
Therefore bear fruit worthy of repentance, and do not begin to say to yourselves, ‘We have Abraham as our father.’ For I say to you that God is able from these stones to raise up children for Abraham.