Question: where in the bible does it say slaves should obey their masters?
Answer: Two verses from Paul in the New Testament - Ephesians 6:5 and Colossians 3:22 - call on slaves to be obedient to their masters. "Bondservants, obey in everything those who are your earthly masters, not by way of eye-service, as people-pleasers, but with sincerity of heart, fearing the Lord.