Genesis 22:10

7 And Isaac spake unto Abraham his father, and said, My father: and he said, Here [am] I, my son. And he said, Behold the fire and the wood: but where [is] the lamb for a burnt offering?

8 And Abraham said, My son, God will provide himself a lamb for a burnt offering: so they went both of them together.

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

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

11 And the angel of the LORD called unto him out of heaven, and said, Abraham, Abraham: and he said, Here [am] I.

12 And he said, Lay not thine hand upon the lad, neither do thou any thing unto him: for now I know that thou fearest God, seeing thou hast not withheld thy son, thine only [son] from me.

13 And Abraham lifted up his eyes, and looked, and behold behind [him] a ram caught in a thicket by his horns: and Abraham went and took the ram, and offered him up for a burnt offering in the stead of his son.