God had told him, “Through Isaac descendants will carry on your name,”

By faith also Isaac blessed Jacob and Esau concerning the future.

By faith Abraham, when he was tested, offered up Isaac. He had received the promises, yet he was ready to offer up his only son.

By faith he lived as a foreigner in the promised land as though it were a foreign country, living in tents with Isaac and Jacob, who were fellow heirs of the same promise.