WCF 29.6

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.¹