1 Corinthians 9:25-27

Young's Literal Translation

²⁵ and every one who is striving, is in all things temperate; these, indeed, then, that a corruptible crown they may receive, but we an incorruptible;

²⁶ I, therefore, thus run, not as uncertainly, thus I fight, as not beating air;

²⁷ but I chastise my body, and bring [it] into servitude, lest by any means, having preached to others -- I myself may become disapproved.