Genesis 21-24.

Hebrews specifically mentions the faith of Abraham several times. Here is the explanation for this extraordinary act: “By faith Abraham, when he was tested, offered up Isaac, and he who had received the promises offered up his only begotten son, of whom it was said, ‘In Isaac your seed shall be called,’ concluding that God was able to raise him up, even from the dead, from which he also received him in a figurative sense” (Hebrews 11:17-19).