John Chrysostom
Having proved, both by the example of the Apostles and by comparisons from life, that a teacher is not forbidden to receive, Paul proceeds to the third proof and says: “Do I say these things according to man? Or does not the law also say the same?” (1 Cor 9:8).
Until now he had brought nothing from the Scriptures, but had referred to generally accepted custom. Therefore, he says, do not think that I rely on this alone and establish a commandment on human opinion.
I can prove that this is pleasing to God and bring forward the ancient law, which commands the same thing.
Here he continues his discourse with a question, as is done in conversation about something perfectly known. He says: “Do I say these things according to man?” That is, do I rely only on human customs?
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“Or does not the law also say the same? For it is written in the law of Moses: You shall not muzzle an ox while it treads out the grain” (1 Cor 9:8-9).
Why does he mention this, when he has the example of the Jewish priests? In order to prove his thought more strongly.
Then, lest someone object, “What concern is it to us what is said about oxen?” he explains it in detail and says: “Is it for oxen that God cares?”
Tell me, then, does God not care for oxen? He cares, but not so as to establish a special law about them alone.
If God had not had something more important in view, and if He had not wished by the example of irrational animals to teach the Jews love for mankind and also remind them of teachers, He would not have shown such care for oxen as to prescribe a law about not muzzling their mouths.
From this another thing is also evident: how great the labor of the teacher is and ought to be. And there is still something else. What is it?
What is said in the Old Testament concerning care for animals chiefly concerns the edification of men. So also everything else, such as what is said about different garments, vineyards, seeds, not sowing land with different seeds, leprosy, and, one might say, all the rest.
Since the hearers were rough people, He spoke to them in this way, so as to raise them little by little to understanding. Nevertheless, the Apostle does not prove what is clear and evident in itself.