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While in prison, Paul met a runaway slave, Onesimus, the property of a Christian -- presumably Pheliemon. He sent the slave back to his owner. This action is forbidden in Deuteronomy 23:15-16:

"Thou shalt not deliver unto his master the servant which is escaped from his master unto thee."

"He shall dwell with thee, even among you, in that place which he shall choose in one of thy gates, where it liketh him best: thou shalt not oppress him."

Rather than give the slave sanctuary, Paul returned him to his owner. Paul seems to hint that he would like Pheliemon to give Onesimus his freedom, but does not actually request it. See the Letter to Philemon in the Christian Scriptures.

Luke 12:45-48: "The lord [owner] of that servant will come in a day when he looketh not for him, and at an hour when he is not aware, and will cut him in sunder, and will appoint him his portion with the unbelievers. And that servant, which knew his lord's will, and prepared not himself, neither did according to his will, shall be beaten with many stripes. But he that knew not, and did commit things worthy of stripes, shall be beaten with few stripes. For unto whomsoever much is given, of him shall be much required: and to whom men have committed much, of him they will ask the more."

Ephesians 6:5-9: "Servants, be obedient to them that are your masters according to the flesh, with fear and trembling, in singleness of your heart, as unto Christ; Not with eyeservice, as menpleasers; but as the servants of Christ, doing the will of God from the heart; With good will doing service, as to the Lord, and not to men: Knowing that whatsoever good thing any man doeth, the same shall he receive of the Lord, whether he be bond or free. And, ye masters, do the same things unto them, forbearing threatening: knowing that your Master also is in heaven; neither is there respect of persons with him."

Need I go on?

You conveniently left out 45. If your slave beats the others and gets drunk on your wine, he should be disciplined. simple.

45 But suppose the servant says to himself, ‘My master is taking a long time in coming,’ and he then begins to beat the other servants, both men and women, and to eat and drink and get drunk.

Ephesians tells slave owners to treat slaves well.

Paul did want to force Phil to do anything (verse 8), so he sent him back hoping Phil would treat Ones like he would Paul. Does not condone slavery.

Interpret things as you wish.