2 Pretending to consecrate cups mixed with wine, and protracting to great length the word of invocation, he contrives to give them a purple and reddish colour, so that Charis, who is one of those that are superior to all things, should be thought to drop her own blood into that cup through means of his invocation, and that thus those who are present should be led to rejoice to taste of that cup, in order that, by so doing, the Charis, who is set forth by this magician, may also flow into them.
Again, handing mixed cups to the women, he bids them consecrate these in his presence. When this has been done, he himself produces another cup of much larger size than that which the deluded woman has consecrated, and pouring from the smaller one consecrated by the woman into that which has been brought forward by himself, he at the same time pronounces these words: “May that Charis who is before all things, and who transcends all knowledge and speech, fill your inner man, and multiply in you her own knowledge, by sowing the grain of mustard seed in you as in good soil.”
Repeating certain other like words, and thus goading on the wretched woman [to madness], he then appears a worker of wonders when the large cup is seen to have been filled out of the small one, so as even to overflow by what has been obtained from it. By accomplishing several other similar things, he has completely deceived many, and drawn them away after him.
Source: Adversus haereses (New Advent)