“Some say, “Why didn’t the New Testament writers come out more strongly against slavery?” Some go as far as saying the Bible endorses slavery. It doesn’t. What Paul recognizes is that slavery was a reality in their time. Just like having to work is a reality for the vast majority of people. And God does scatter His people into all these places and corners so that they can shine the light of the Gospel in all places.
The Gospel does lead to the abolition of slavery. We’ve seen that in history and we’ll see elements of it in our text. But Paul is talking about here-and-now Christianity in practice. And he says, “Ok, you are slaves. Here’s the way you should slave.” Now, if you could buy your freedom, great. If you master wanted to free you, Paul didn’t say, “No, stay as a slave.” But it was always about glorifying God and doing what was Godly, even if your circumstances weren’t good.”