Passover, also called Pesah, is a Jewish festival that celebrates the flight of the Israelites from Egyptian slavery, probably in the 1200's B.C. The story of Passover is told in the Bible in Chapter 12 of the Book of Exodus. Passover begins in March or April, on the 15th day of the Hebrew month of Nisan. Most Jews celebrate Passover for eight days, but Jews in Israel, and Reform Jews in other countries, celebrate it for seven days.