The Catechism in Questions & Answers

496. Is there a relationship between the Passover meal and Holy Communion?

Yes, there is a relationship: according to the account of first three gospels, Jesus instituted Holy Communion with His Apostles during the Passover meal. Like the Passover, the Lord’s Supper is also a meal of commemoration. The Passover commemorates the liberation of the Israelites from captivity in Egypt. Holy Communion refers to deliverance in a much broader sense, namely to the redemption of mankind from the bondage of sin.

Redemption: see Questions 89.-90., 108.-109., 215.-216.