Hebrews 11:7, 17-18

By faith Noah, being warned of God of things not seen as yet, moved with fear, prepared an ark to the saving of his house; by the which he condemned the world, and became heir of the righteousness which is by faith.

By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son, of whom it was said, That in Isaac shall thy seed be called