After traveling with Onesimus for a while, Paul sent him back to Philemon to re-enslave him.
The word 'servant' is translated from the greek doulos, Strong's G1401. It literally means 'slave.'
In our modern day, it is hard to be reconciled with this passage. Slavery in the Americas has been abolished since 1888, when Brazil outlawed it. It is hard for many readers to transport themselves back two thousand years, when Paul wrote this letter, to understand how Paul could do this, since we mostly live in a post-slavery world. So, rather than attempt to describe that, we will instead look to see what the law has to say about someone in Paul and Onesimus's position.
It is recorded in Deuteronomy,
Now Paul was a Jew, a Pharisee. Paul must have known this commandment. Yet Paul still sent Onesimus back into slavery. How could Paul be so cold-hearted to deny God and send a man back into slavery?
Value of this Evidence
This is indefensible evidence for Paul being a false apostle. He disobeys the Lord and then sentences a man back into a harsh life. There is no excuse for this.