II. In this sacrament Christ is not offered up to his Father, nor any real sacrifice made at all for remission of sins of the quick or dead, but a commemoration of that one offering up of himself, by himself, upon the cross, once for all, and a spiritual oblation of all possible praise unto God for the same; so that the Popish sacrifice of the mass, as they call it, is most abominably injurious to Christ's one only sacrifice, the alone propitiation for all the sins of the elect.
V. The outward elements in this sacrament, duly set apart to the uses ordained by Christ, have such relation to him crucified, as that truly, yet sacramentally only, they are sometimes called by the name of the thigns they represent, to wit, the body and blood of Christ; albeit, in substance and nature, they still remain truly, and only, bread and wine, as they were before.
VI. That doctrine which maintains a change of the substance of bread and wine, into the substance of Christ's body and blood (commonly called transubstantiation) by consecration of a priest, or by any other way, is repugnant, not to Scripture alone, but even to common-sense and reason; overthroweth the nature of the sacrament; and hath been, and is, the cause of manifold superstitions, yea, of gross idolatries.
VII. Worthy receivers, outwardly partaking of the visible elements in this sacrament, do then also inwardly by faith, really and indeed, yet not carnally and corporally, but spiritually, receive and feed upon Christ crucified, and all benefits of his death: the body and blood of Christ being then not corporally or carnally in, with, or under the bread and wine; yet as really, but spiritually, present to the faith of believers in that ordinance, as the elements themselves are to their outward senses.
-Westminster Confession of Faith (XXIX;ii,v-vii)