Dear sister in Christ,
From The Form Of Prayers And Ministration Of The Sacraments as practiced in Geneva (1556), approved by both John Calvin and John Knox. It should be observed how the singualrty of divinsion of the same cup among the communicants is used in the following lnaguage.
"This done, the Minister breaketh the bread, and delivereth it to the people, who distribute and divide the same amongst themselves, according to our Savior Christ’s commandment, and in likewise giveth the cup (Works of John Knox, [Bannatyne Club: Edinburgh] 1855, 4:196, emphases added).
"Our Lord having commanded his disciples to eat the bread sanctified in his body, when he comes to the cup, does not say simply, “drink,” but he adds expressly, that all are to drink. Would we have any thing clearer than this? He says that we are to eat the bread without using an universal term. He says that we are all to drink of the cup."
Calvin, Harmony of the Gospels. Here he is speaking to the subject of the Passover (and His participation in Holy Supper, or not), but the singularity of a common cup still remains. Note,
"As Luke mentions that the cup was twice presented by Christ, we must inquire, in the first place, if it be a repetition, (as the Evangelists are wont frequently to say the same thing twice,) or if Christ, after having tasted the cup, repeated the same thing a second time. This latter conjecture appears to me to be probable; for we know that the holy fathers, during sacrifices, observed the solemn rite of tasting the cup; and hence the words of the Psalmist, ‘I will take the cup of salvation, and will call on the name of the Lord,’ (Ps. 116:13.) I have no doubt, therefore, that Christ, according to the ancient custom, tasted the cup in the holy feast, which otherwise could not have been correctly observed; and Luke expressly mentions this, before coming to give an account of the new mystery, which was a totally different institution from the paschal lamb".
Calvin's Vomments on 1 Cor 11:25,
"The cup, when he had supped The Apostle seems to intimate, that there was some interval of time between the distribution of the bread and that of the cup, and it does not quite appear from the Evangelists whether the whole of the transaction was continuous. This, however, is of no great moment, for it may be that the Lord delivered in the meantime some address, after distributing the bread, and before giving the cup. As, however, he did or said nothing that was not in harmony with the sacrament, we need not say that the administration of it was disturbed or interrupted. I would not, however, render it as Erasmus does — supper, being ended, for, in a matter of so great importance, ambiguity ought to be avoided".
That Calvin employed the use of the Common Cup has never been disputed.
Kindly,