Titus 2:9-10

Perhaps another problem among slaves was that they were stealing. I guess as a slave, you don't have much, so they may resort to stealing. Regardless, this is a bad thing, and Paul clearly tells them not to do it. Instead of pilfering, they are to show good faith. Acting and living in such a way allows them to adorn the doctrine of God. Do you really think you can adorn the doctrine of God as someone who isn't submissive to their masters and/or one who pilfers? They are to show good faith, which I guess is the outward appearance and result of your faith. The faith in God our savior should result in something outward, part of which in a sense is being submissive and not doing things like stealing.