25 Learn what occurred when I myself was present and a witness Some parents who by chance were escaping, being little careful on account of their terror, left a little daughter under the care of a wet-nurse. The nurse gave up the forsaken child to the magistrates. They gave it, in the presence of an idol whither the people flocked (because it was not yet able to eat flesh on account of its years), bread mingled with wine, which however itself was the remainder of what had been used in the immolation of those that had perished.
Subsequently the mother recovered her child. But the girl was no more able to speak, or to indicate the crime that had been committed, than she had before been able to understand or to prevent it. Therefore it happened unawares in their ignorance, that when we were sacrificing, the mother brought it in with her. Moreover, the girl mingled with the saints, became impatient of our prayer and supplications, and was at one moment shaken with weeping, and at another tossed about like a wave of the sea by the violent excitement of her mind; as if by the compulsion of a torturer the soul of that still tender child confessed a consciousness of the fact with such signs as it could.
When, however, the solemnities were finished, and the deacon began to offer the cup to those present, and when, as the rest received it, its turn approached, the little child, by the instinct of the divine majesty, turned away its face, compressed its mouth with resisting lips, and refused the cup. Still the deacon persisted, and, although against her efforts, forced on her some of the sacrament of the cup. Then there followed a sobbing and vomiting. In a profane body and mouth the Eucharist could not remain; the draught sanctified in the blood of the Lord burst forth from the polluted stomach. So great is the Lord's power, so great is His majesty. The secrets of darkness were disclosed under His light, and not even hidden crimes deceived God's priest.
Source: The Treatises of Cyprian (New Advent)