1 Corinthians 9:27 in the World English Bible
but I beat my body and bring it into submission, lest by any means, after I have preached to others, I myself should be disqualified.
Context
26 I therefore so run, not as uncertainly; so fight I, not as one that beateth the air:
27 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.