Genesis 22:8 "And Abraham said, “My son, God will provide Himself a lamb for a burnt offering.”
Amazingly prophecy out of Genesis. Behold, the Lamb of God, who takes away the sin of the world. God would provide Himself as the lamb on this mountain, mt Moriah. This same place later called Calvary. So very awesome, God's word has always been. His plan of salvation for humanity has always been to offer Himself, in due season.