Genesis 22:8-13

8And Abraham said, “My son, God will provide for Himself the lamb for a burnt offering.” So the two of them went together.

9Then they came to the place of which God had told him. And Abraham built an altar there and placed the wood in order; and he bound Isaac his son and laid him on the altar, upon the wood.

10And Abraham stretched out his hand and took the knife to slay his son.

11But the Angel of the Lord called to him from heaven and said, “Abraham, Abraham!” So he said, “Here I am.”

12And He said, “Do not lay your hand on the lad, or do anything to him; for now I know that you fear God, since you have not withheld your son, your only son, from Me.”

13Then Abraham lifted his eyes and looked, and there behind him was a ram caught in a thicket by its horns. So Abraham went and took the ram, and offered it up for a burnt offering instead of his son.