Passover in the Bible refers to the event described in the book of Exodus when God instructed the Israelites to mark their houses with the blood of a lamb so that the Lord would "pass over" their house and spare their firstborn son. This event commemorates Gods deliverance of the Hebrews from slavery in Egypt and His creation of the Israelite people. Passover is one of the most widely celebrated Jewish holidays and is considered the oldest and most important religious festival in Judaism. The festival begins at sunset on the 14th of Nisan and marks the beginning of a seven-day celebration, which includes the Feast of Unleavened Bread. Passover is often celebrated with great pomp and ceremony, especially on the first night, when a special family meal called the seder is held. The New Testament Passover is a memorial of the suffering and death of Jesus. Passover is also significant in Christianity, as it is seen as the fulfillment of the lamb sacrificed for Passover, and Christians now partake in the communion of His body and blood.