Nicene and Post-Nicene Fathers, Ser. II, Vol. XIV:
The Canons of the Synods of Sardica, Carthage, Constantinople, and Carthage Under St. Cyprian, Which Canons Were Received by the Council in Trullo and Ratified by II. Nice.: Canon CXXIV

Canon CXXIV.  (Greek cxxv.)

Of bishops who shall lie with regard to Donatists’ communions.

If it shall be proven that any bishop has lied concerning the communion of those [who had been Donatists], and had said that they had communicated when he knew it was an established fact that they had not done so, let him lose his bishoprick.

Notes.

Ancient Epitome of Canon CXXIV.

Whoso says that a man, whom he knows does not communicate, does communicate is to be deprived of his episcopate.

This is Canon xvj. of Carthage, a.d. 418.