Bible Verses About Warfare of Saints: With self-denial

Every man who strives in the games exercises self-control in all things. Now they do it to receive a corruptible crown, but we an incorruptible.

I therefore run like that, as not uncertainly. I fight like that, as not beating the air,

but I beat my body and bring it into submission, lest by any means, after I have preached to others, I myself should be rejected.