1 Corinthians 9:27
No, I discipline my body and make it my slave, so that after I have preached to others, I myself will not be disqualified.
What it says
Instead, he disciplines his body and makes it his slave, so that after preaching to others he himself will not be disqualified.
What it is doing
It ends the chapter with the need for personal vigilance.
In context
24Do you not know that in a race all the runners run, but only one receives the prize? Run in such a way as to take the prize. 25Everyone who competes in the games trains with strict discipline. They do it for a crown that is perishable, but we do it for a crown that is imperishable. 26Therefore I do not run aimlessly; I do not fight like I am beating the air. 27No, I discipline my body and make it my slave, so that after I have preached to others, I myself will not be disqualified.