1 Corinthians 11:24-25, This Cup Is the New Testament In My Blood
William MacDonald observed well, “The Lord’s Supper was instituted immediately after the Passover Feast. That is why it says that the Lord Jesus took the cup after supper. In connection with the cup, He said that it was the new covenant (testament) in His blood. This refers to the covenant that God promised to the nation of Israel in Jeremiah 31:31–34.”