But there is one problem. It seems that lambs were not sacrificed on the altar of the Jerusalem temple. There are other references to lambs in the Old Testament. A nother reference to lambs is in the Book of Exodus where Moses announces that God is about to act. God will lead his people out of Egypt into the promised land.
Resistance comes from Pharaoh.
God smites the land with plagues which makes Pharaoh more stubborn. Then God sends the angel of death. The Children of Israel are warned that they are about to depart. They are to prepare a meal of lamb and herbs. The blood of the lamb is to be smeared on the doorposts.