Nicene and Post-Nicene Fathers, Ser. II, Vol. XIV:
The Canons of the Councils of Ancyra, Gangra, Neocæsarea, Antioch and Laodicea, which Canons were Accepted and Received by the Ecumenical Synods.: Canon III

Canon III.

If any one shall teach a slave, under pretext of piety, to despise his master and to run away from his service, and not to serve his own master with good-will and all honour, let him be anathema.

Notes.

Ancient Epitome of Canon III.

Anathema to him who persuades a slave to leave his master under pretence of religion.

Van Espen.

This canon is framed in accordance with the doctrine of the Apostle, in 1 Tim. 6.1.  “Let as many servants as are under the yoke count their own masters worthy of all honour, that the name of God and his doctrine be not blasphemed.”  And again the same Apostle teaches his disciple Titus that he should “exhort servants to be obedient unto their own masters, and to please them well in all things; not answering again; not purloining, but shewing all good fidelity; that they may adorn the doctrine of God our Saviour in all things.” (Titus 2.9-10.)

These texts are likewise cited by Balsamon and Zonaras.

This Canon is found in the Corpus Juris Canonici, Gratian’s Decretum, Pars. II., Causa XVII., Q. IV., c. xxxvij. in the version of Isidore, and again in c. xxxviij. from the collections of Martin Bracarensis (so says Van Espen) and assigned to a council of Pope Martin, Canon xlvii.