Leviticus 23:4 On the fourteenth day of the first month at twilight is the Lord's Passover.
The Hebrew word 'Pesach' means to pass over, to exempt or to spare. Passover, which begins on the 14th day of Nisan (the first month of the Jewish calendar) celebrates the epic exodus of the nation of Israel out of bondage. The Jews had been slaves in Egypt for generations, but were refused their freedom despite plague after plague being visited by God, on the Egyptians, through Moses. However the night before the final ‘plague’ which caused Pharaoh to change his mind, the Israelites were given very explicit instructions...
They were to sacrifice a lamb and place the blood upon the door posts and lintels of their homes.