1 Timothy 4:7-12 NASB
But have nothing to do with worldly fables fit only for old women. On the other hand, discipline yourself for the purpose of godliness; for bodily discipline is only of little profit, but godliness is profitable for all things, since it holds promise for the present life and also for the life to come. It is a trustworthy statement deserving full acceptance. For it is for this we labor and strive, because we have fixed our hope on the living God, who is the Savior of all men, especially of believers.
Prescribe and teach these things. Let no one look down on your youthfulness, but rather in speech, conduct, love, faith and purity, show yourself an example of those who believe.
NASB: New American Standard Bible