Colossians 3:22-24

²²Slaves, in all things obey those who are your masters on earth, not with external service, as those who merely please men, but with sincerity of heart, fearing the Lord. ²³Whatever you do, do your work heartily, as for the Lord rather than for men, ²⁴knowing that from the Lord you will receive the reward of the inheritance. It is the Lord Christ whom you serve.