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 XL

Canon XL.  (Greek xliii.)

Concerning the non-frequenting of taverns by the clergy, except when travelling.

That the clergy are not to enter taverns for eating or drinking, nor unless compelled to do so by the necessity of their journey.

Notes.

Ancient Epitome of Canon XL.

A cleric on a journey may enter a tavern, otherwise not.

This canon is Canon xxvj. of the Synod of Hippo, a.d. 393.