Before Abraham died, he gave some gifts to his sons who were from his slave women. He sent them to the East, away from Isaac. Then Abraham gave everything he owned to Isaac.
Sarah said to Abraham, “Get rid of that slave woman and her son. Send them away! When we die, our son Isaac will get everything we have. I don’t want that slave woman’s son sharing these things with my son Isaac!”
Abraham was almost a hundred years old, so he was past the age for having children. Also, Sarah could not have children. Abraham was well aware of this, but his faith in God never became weak.