1 Corinthians 9

But we have not made use of this right. Instead we endure everything so that we may not be a hindrance to the gospel of Christ. Don’t you know that those who serve in the temple eat food from the temple, and those who serve at the altar receive a part of the offerings? In the same way the Lord commanded those who proclaim the gospel to receive their living by the gospel. But I have not used any of these rights. - NET