Passover (Hebrew: פסח; transliterated as Pesach or Pesah), also called חג המצות (Chag HaMatzot - Festival of Matzot) is a Jewish holiday which is celebrated in the spring. It begins on the 15th day of Nisan (on the Hebrew calendar), which falls between March 15-April 30. Passover commemorates the Exodus and freedom of the Israelites from ancient Egypt. As described in the Book of Exodus, Passover marks the "birth" of the Jewish nation, as the Jews' ancestors were freed from being slaves of Pharaoh and allowed to become servants of God instead.