Hebrews 11:17-20

By faith Abraham, being tried, offered up Isaac: yea, he that had gladly received the promises was offering up his only begotten son; even he to whom it was said, In Isaac shall thy seed be called: accounting that God is able to raise up, even from the dead; from whence he did also in a figure receive him back. By faith Isaac blessed Jacob and Esau, even concerning things to come.