On his last night before he went to the cross, Jesus sat down to have communion with his disciples. The purpose of communion is not some sort of religious ritual, but is served as remembrance of Jesus' atoning sacrifice on the cross for people to have a relationship with God. It is also a proclamation before God of the importance of Jesus' work before he comes back and an opportunity for fellowship of Christians. Communion is one of the two New Testament rituals believers are called to practice at their discretion because of the freedom they have in Jesus Christ.