3 John 1:8

Giving financial and hospitable aid makes the giver a partner with the receiver in his work (cf. 2 John 1:10-11). Since pagans did not support Christian preachers and teachers, the duty of Christians to support them was even greater.

"As a deacon expressed it to me in the first church I pastored, ’You pay your board where you get your food!’ It is unbiblical for church members to send their tithes and offerings all over the world and neglect to support the ministry of their own local church." [Note: Ibid.]

Note John’s emphasis on the truth again. Preaching the gospel is proclaiming the truth.