Jamieson, Fausset and Brown on Colossians 3:25

25. But--The oldest manuscripts read, "for," which accords with "serve ye," &c. (Col 3:24), the oldest reading: the for here gives a motive for obeying the precept. He addresses the slaves: Serve ye the Lord Christ, and leave your wrongs in His hands to put to rights: (translate), "For he that doeth wrong shall receive back the wrong which he hath done (by just retribution in kind), and there is no respect of persons" with the Great Judge in the day of the Lord. He favors the master no more than the slave (Re 6:15).