1 Corinthians 9:27

27 No, I strike a blow to my body and make it my slave so that after I have preached to others, I myself will not be disqualified for the prize.

Read 1 Corinthians 9:27 Using Other Translations

But I keep under my body, and bring it into subjection: lest that by any means, when I have preached to others, I myself should be a castaway.
But I discipline my body and keep it under control, lest after preaching to others I myself should be disqualified.
I discipline my body like an athlete, training it to do what it should. Otherwise, I fear that after preaching to others I myself might be disqualified.