The Apostle Paul
Colossians 3:22BSB·traditional attribution

Slaves, obey your earthly masters in everything, not only to please them while they are watching, but with sincerity of heart and fear of the Lord.

Geneva Bible Notes Reformed

Servants, obey in all things [your] masters according to the flesh; not with eyeservice, as menpleasers; but in singleness of heart, fearing God: (14) Of servants, that fearing God himself to whom their obedience is acceptable, they reverently, faithfully, and from the heart, obey their masters.

John Gill Reformed Baptist

Servants, obey in all things your masters,.... That is, in all things relating to the body, and bodily service; not to the conscience, and religious worship; in things worldly, and not spiritual; in all things that are within a master's power, and it is lawful for him to command; and in all things that are fitting and proper that a servant should do; and even...

John Calvin Reformed

22 Servants, be obedient. Anything that is stated here respecting servants requires no exposition, as it has been already expounded in commenting on Ephesians 6:1, with the exception of these two expressions, — For we serve the Lord Christ; and, He that will act unjustly will receive the reward of his iniquity.