The Bible clearly teaches that those who preach the gospel message full time are entitled to financial support by other Christians. Nevertheless, true ministers who have a pure heart are not “in it for the money.” They are in it because they genuinely care about the souls of other humans. That is why sometimes they will keep fighting to continue their ministry even after financial contributions dry up. God will give them a heavenly reward for this.
What then is my reward? That, when I preach the gospel, I may offer the gospel without charge, so as not to make full use of my right in the gospel. (I Corinthians 9:18).