Genesis 22:2

22:2 God said, “Take your son – your only son, whom you love, Isaac – and go to the land of Moriah! Offer him up there as a burnt offering on one of the mountains which I will indicate to you.”

Genesis 22:13

22:13 Abraham looked up and saw behind him a ram caught in the bushes by its horns. So he went over and got the ram and offered it up as a burnt offering instead of his son.