1 Corinthians 9:7
Who ever serves as a soldier at his own charges; Who plants a vineyard, and eats not of its fruit? Or who feeds a flock, and eats not of the milk of the flock?
2 Corinthians 10:4
(for the weapons of our warfare are not fleshly, but mighty through God for the casting down of strongholds);
1 Timothy 1:18
This charge I commit to you, child Timothy, according to the prophecies going before in respect to you, that you may war with these the noble warfare;
1 Timothy 6:12
Fight the good fight of the faith, lay hold on the eternal life, to which you were called, and confessed a good confession before many witnesses.
2 Timothy 2:3-5
Suffer hardship with me, as a good soldier of Christ Jesus.