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 LXX

p. 478 Canon LXX.  (Greek lxxiii.)

What clerics should abstain from their wives.

Moreover since incontinence has been charged against some clergymen with regard to their own wives it has seemed good that bishops, presbyters, and deacons should according to the statutes already made abstain even from their own wives; and unless they do so that they should be removed from the clerical office.  But the rest of the clergy shall not be forced to this but the custom of each church in this matter shall be followed.

Notes.

Ancient Epitome of Canon LXX.

Bishops, presbyters and deacons shall abstain for their wives or else be removed from the ecclesiastical order.  But the rest of the clergy shall not be forced to the same:  but let the custom be observed.

This is Canon iv. of Carthage, September, a.d. 401.

Johnson.

A repetition of Canon 25 (28).