These elements witness Christ death until he returns. This is the best name for the Lord's body and blood offering. The context shows its part of a religious service. Only discusses cup. This is a full service which includes foot washing, communion and christian fellowship.
Various church doctrines on communion.
This is the Roman Catholic doctrine. Jesus is continuously being sacrificed every time a Mass occurs. The Lutheran doctrine is similar to the Catholic view. Jesus death occurs again when the bread and wine enter the person. This is not found in the scripture.