Colossians 4:1

4:1 Masters, treat your slaves with justice and fairness, because you know that you also have a master in heaven.

Philemon 1:10-16

1:10 I am appealing to you concerning my child, whose spiritual father I have become during my imprisonment, that is, Onesimus, 1:11 who was formerly useless to you, but is now useful to you and me. 1:12 I have sent him (who is my very heart) back to you. 1:13 I wanted to keep him so that he could serve me in your place during my imprisonment for the sake of the gospel. 1:14 However, without your consent I did not want to do anything, so that your good deed would not be out of compulsion, but from your own willingness. 1:15 For perhaps it was for this reason that he was separated from you for a little while, so that you would have him back eternally, 1:16 no longer as a slave, but more than a slave, as a dear brother. He is especially so to me, and even more so to you now, both humanly speaking and in the Lord.