Even so has the Lord ordained that they who preach the gospel should live of the gospel.
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Ambrosiaster
AD 400
It was not by the law of Moses that God followed the practice of the Gentiles, but natural reason itself decrees that a person should live from his labor. Commentary on Paul’s Epistles.
The apostle says this [here and in Timothy :–] so that Timothy might understand that what he took from those for whom he was, as it were, fighting, and whom he was cultivating as a vine, or feeding as a flock, was not a sign of begging but an acknowledgment of a right.