Whether the Paschal Lamb was the chief figure of this sacrament?

Objections

Objection 1 : It seems that the Paschal Lamb was not the chief figure of this sacrament, because (Ps. 109:4) Christ is called "a priest according to the order of Melchisedech," since Melchisedech bore the figure of Christ's sacrifice, in offering bread and wine. But the expression of likeness causes one thing to be named from another. Therefore, it seems that Melchisedech's offering was the "principal" figure of this sacrament.
Objection 2 : Further, the passage of the Red Sea was a figure of Baptism, according to 1 Cor. 10:2: "All . . . were baptized in the cloud and in the sea." But the immolation of the Paschal Lamb was previous to the passage of the Red Sea, and the Manna came after it, just as the Eucharist follows Baptism. Therefore the Manna is a more expressive figure of this sacrament than the Paschal Lamb.
Objection 3 : Further, the principal power of this sacrament is that it brings us into the kingdom of heaven, being a kind of "viaticum." But this was chiefly prefigured in the sacrament of expiation when the "high-priest entered once a year into the Holy of Holies with blood," as the Apostle proves in Heb. 9. Consequently, it seems that that sacrifice was a more significant figure of this sacrament than was the Paschal Lamb.