Passover is a Jewish holiday to commemorate Jewish liberation from slavery in Egypt. In the narrative of the Exodus, the Hebrew Testament tells that God helped the Children of Israel escape from their slavery in Egypt by the death of all Egyptian first-borns. The Israelites were instructed to mark the doorposts of their homes with the blood of a slaughtered spring lamb and, upon seeing this, the spirit of the Lord knew to pass over the first-born in these homes, hence the English name of the holiday. When Pharaoh freed the Israelites, it is said that they left in such a hurry that they could not wait for bread dough to rise. In commemoration, matzo (flat unleavened bread) is eaten during this holiday.