2 Timothy 2:2-5

2And the things that you have heard from me among many witnesses, commit these to faithful men who will be able to teach others also.

3You therefore must endure hardship as a good soldier of Jesus Christ.

4No one engaged in warfare entangles himself with the affairs of this life, that he may please him who enlisted him as a soldier.

5And also if anyone competes in athletics, he is not crowned unless he competes according to the rules.