1 Corinthians 9:27

keep under--literally, "bruise the face under the eyes," so as to render it black and blue; so, to chastise in the most sensitive part. Compare "mortify the deeds of the body," Rom 8:13; also Pe1 2:11. It is not ascetic fasts or macerations of the body which are here recommended, but the keeping under of our natural self-seeking, so as, like Paul, to lay ourselves out entirely for the great work. my body--the old man and the remainders of lust in my flesh. "My body," so far as by the flesh it opposes the spirit [ESTIUS] (Gal 5:17). Men may be severe to their bodies and yet indulge their lust. Ascetic "neglect of the body" may be all the while a more subtile "satisfying of the flesh" (Col 2:23). Unless the soul keep the body under, the body will get above the soul. The body may be made a good servant, but is a bad master. bring it into subjection--or bondage, as a slave or servant led away captive; so the Greek. preached--literally, "heralded." He keeps up the image from the races. The heralds summoned the candidates for the foot race into the race course [PLATO, Laws, 8.833], and placed the crowns on the brows of the conquerors, announcing their names [BENGEL]. They probably proclaimed also the laws of the combat; answering to the preaching of the apostles [ALFORD]. The The Christian herald is also a combatant, in which respect he is distinguished from the herald at the games.

— Jamieson-Fausset-Brown Commentary (public domain)