Passover, also called Pesach, is a major Jewish holiday for Rabbinical Judaism, Karaite Judaism, and Samaritanism, one of the Three Pilgrimage Festivals, that celebrates the Exodus of the Israelites from slavery in Biblical Egypt. According to the Book of Exodus, God commanded Moses to tell the Israelites to slaughter a lamb and mark their doorframes with its blood, in addition to instructions for... Wikipedia