What does the Bible say about the preacher's reward?

In 1 Corinthians 9:17, Paul explains that if he preaches the gospel willingly, he has a reward, indicating that the intrinsic joy of fulfilling God's calling is itself a reward. He emphasizes that the concept of reward isn't just about gaining something but is tied to the satisfaction and fulfillment that comes from serving God and preaching His word. This idea aligns with the notion that doing what one loves, especially when it concerns God's work, is its own reward, distinguishing it from the ordinary labor done merely for financial gain.