Genesis 22:12-13

12“Do not lay a hand on the boy or do anything to him,” said the angel, “for now I know that you fear God, since you have not withheld your only son from me.1”

13Then Abraham looked up and saw behind him a ram2 in a thicket, caught by its horns. So he went and took the ram and offered it as a burnt offering in place of his son.