But God replied, 'No--Sarah, your wife, will give birth to a son for you. You will name him Isaac, and I will confirm my covenant with him and his descendants as an everlasting covenant.
As for Ishmael, I will bless him also, just as you have asked. I will make him extremely fruitful and multiply his descendants. He will become the father of twelve princes, and I will make him a great nation.
But my covenant will be confirmed with Isaac, who will be born to you and Sarah about this time next year.'
When God had finished speaking, he left Abraham.
On that very day Abraham took his son, Ishmael, and every male in his household, including those born there and those he had bought. Then he circumcised them, cutting off their foreskins, just as God had told him.
Abraham was ninety-nine years old when he was circumcised,
and Ishmael, his son, was thirteen.
Both Abraham and his son, Ishmael, were circumcised on that same day,
along with all the other men and boys of the household, whether they were born there or bought as servants. All were circumcised with him.