1 Corinthians 9:24-27 NIV

24 Do you not know that in a race all the runners run, but only one gets the prize? Run in such a way as to get the prize.
25 Everyone who competes in the games goes into strict training. They do it to get a crown that will not last, but we do it to get a crown that will last forever.
26 Therefore I do not run like someone running aimlessly; I do not fight like a boxer beating the air.
27 No, I strike a blow to my body and make it my slave so that after I have preached to others, I myself will not be disqualified for the prize.

Colossians 3:23-24 KJV

23 And whatsoever ye do, do it heartily, as to the Lord, and not unto men;
24 Knowing that of the Lord ye shall receive the reward of the inheritance: for ye serve the Lord Christ.

2 Timothy 4:6-8 AMPC

6 For I am already about to be sacrificed [my life is about to be poured out as a drink offering]; the time of my [spirit’s] release [from the body] is at hand and I will soon go free.
7 I have fought the good (worthy, honorable, and noble) fight, I have finished the race, I have kept (firmly held) the faith.
8 [As to what remains] henceforth there is laid up for me the [victor’s] crown of righteousness [for being right with God and doing right], which the Lord, the righteous Judge, will award to me and recompense me on that [great] day—and not to me only, but also to all those who have loved and yearned for and welcomed His appearing (His return).