John Chrysostom — on Phlm 1:2 (Homily on Philemon 1)

“"And to the Church in thy house." Here he has not omitted even the slaves. For he knew that often even the words of slaves have power to overthrow their master; and more especially when his request was in behalf of a slave. And perhaps it was they particularly who exasperated him. He does not suffer them therefore to fall into envy, having honored them by including them in a salutation with their masters. And neither does he allow the master to take offense. For if he had made mention of them by name, perhaps he would have been angry. And if he had not mentioned them at all, he might have been displeased. Observe therefore how prudently he has found a way by his manner of mentioning them, both to honor them by his mention of them, and not to wound him. For the name of the "Church" does not suffer masters to be angry, even though they are reckoned together with their servants. For the Church knows not the distinction of master and servant. By good actions and by sins she defines the one and the other. If then it is a Church, be not displeased that thy slave is saluted with thee. "For in Christ Jesus there is neither bond nor free." (Gal. iii. 28.)”