1 Corinthians 9:14

14SoοὕτωςalsoκαὶtheὁLordκύριοςhas prescribedδιέταξενto thoseτοῖςtheτὸgospelεὐαγγέλιονproclaimingκαταγγέλλουσινfromἐκtheτοῦgospelεὐαγγελίουto liveζῆν.

So also, the Lord directed those proclaiming the gospel to live from the gospel.