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. Whatever you do, work heartily, as for the Lord and not for men, knowing that from the Lord you will receive the inheritance as your reward. You are serving the Lord Christ. For the wrongdoer will be paid back for the wrong he has done, and there is no partiality. Masters, treat your bondservants justly and fairly, knowing that you also have a Master in heaven. (Colossians 3:22–25, ESV)

Below are supplemental resources to help you study further on the subject.

Slavery

Philemon, Slavery, and the gospel of Reconciliation – sermon by Anthony Caples 
Does the Bible endorse slavery? – video by ​​Southern Seminary
Why It’s Wrong to Say the Bible Is Pro-Slavery – article by The Gospel Coalition
Does the Bible Support Slavery? – video by Pastor Derwin L. Gray
The Color of Compromise: The Truth about the American Church’s Complicity in Racism – book by Jamar Tisby
Why Did God Permit Slavery? – article by Desiring God
How Paul Worked to Overcome Slavery – article by Desiring God
What Do We Do With Our Slavery-Affirming Theological Heroes? – article by Desiring God
Jesus and The Disinherited – book by  by Howard Thurman
Justice – video by The Bible Project
The Sin of Racism – article by Tim Keller

Work

Every Good Endeavor: Connecting Your Work to God’s Work – book by Timothy Keller
Garden City: Work, Rest, and the Art of Being Human – book by John Mark Comer
How Does Christ Change How I Work? – article by John Piper
Should Christians Work in Secular Jobs? – video by Ruslan
Work Matters: Connecting Sunday Worship to Monday Work – book by Tom Nelson
Work and Our Labor in the Lord – book by James M. Hamilton Jr.
Redefining Work – video by Tim Keller