The Lord’s Supper, like Passover, is a visible sign of Christ’s sacrifice, symbolizing believers’ participation in his suffering and death. It is not a re-sacrifice but a nourishment in Christ’s one-time sacrifice. Christ, as the Passover lamb symbolizes, protects his redeemed people, and the sacraments hold out his grace and power and they do not hold out a different grace or a different power.  They represent the one true Gospel.