John Chrysostom
The Apostle takes great care to prove that receiving support from those who are taught is not forbidden. Having already spoken of this, he is not content with it. He again turns to the Law and presents from it an example closer than the preceding one. For it is not the same thing to offer oxen as an example and to cite a clear law concerning priests.
Look here also at Paul's wisdom, and how fittingly he sets forth the matter. He did not say, "those who perform sacred rites receive from those who offer." What did he say? "They eat from the sanctuary," so as not to humble those who receive or give those who offer an occasion for pride.
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He speaks in the same way afterward. He did not say, "those who serve the altar receive from those who offer sacrifices," but, "they share in the altar." For what is offered belongs no longer to those who offer it, but to the sanctuary and the altar.
Nor did he say, "they receive sacred things," but, "they eat from the sanctuary." He expresses moderation and teaches that one must not gather possessions and become rich. By the words "they share in the altar," he does not indicate an equal division, but the support given to priests by right.
The Apostles had a much greater right, because there honor was joined to priesthood, but here there are dangers, torments, and death. Therefore the strongest of all examples was expressed in the words, "If we have sown spiritual things among you." The word "sown" points to the storms, dangers, punishments, and unspeakable calamities to which the preachers were subjected.
Yet even with such an advantage, he did not lower the Old Testament ministry or exalt his own. On the contrary, he speaks of his own with humility. He points to the advantage not in dangers, but in the greatness of the gift.
He did not say, "if we have undergone dangers or calamities," but, "if we have sown spiritual things among you." When speaking of the priests, he exalts them as much as possible and says, "those who perform sacred rites" and "those who serve the altar." By this he wishes to show their unceasing ministry and constancy.
In discussing the Jewish priests, he pointed both to the Levites and to the high priests, to both ranks, the lower and the higher. He indicated the first by the words, "those who perform sacred rites," and the second by the words, "those who serve the altar." For the same work was not entrusted to all. Lower duties were entrusted to some, and higher duties to others.
Having pointed to them all, lest someone say, "Why do you remind us of the Old Testament? Do you not know that now is the time of more perfect commandments?" he then sets forth what is most important: "So also the Lord," he says, "commanded those who preach the Gospel to live from the Gospel."
Here also he does not say, "to be fed by men." Rather, just as he said concerning the priests, "from the sanctuary" and "from the altar," so here he says, "from the Gospel." And as there he says, "to eat," so here he says, "to live," not to trade or become rich. "For the laborer," he says, "is worthy of his food" (Mt 10:10).