Exodus 12 is the account of the last plague and the eventual "exodus" of the Israelites. The Lord gave Moses and Aaron lots of specific instructions as to the proper timing and details of how they must prepare a lamb for the "passover". They were told to "take some of the blood and put it on the sides and tops of the door frames of the houses where they eat the lambs". And the blood would be a sign for the Lord to pass over, when He goes throughout Egypt striking down every firstborn in judgment of Egypt. This occurred on the fourteen day of the first month, just as the Lord had said, and there was "loud wailing in Egypt, for there was not an (Egyptian) house without someone dead". Pharaoh summoned Moses and said, "Leave my people, you and the Israelites! Go, worship the Lord as you have requested". God had seen the misery of His people and rescued them, and the Israelites journeyed out of Egypt that night.