John Chrysostom
After saying, “Is it for oxen that God cares?” he continues: “Or is it certainly for our sake that He says it?” (1 Cor 9:10). He did not place the word “certainly” without purpose, but so as not to give the hearer occasion to object.
Meanwhile he continues the metaphor and says: “Yes, for our sake it was written. For he who plows ought to plow in hope.” That is, the teacher must receive recompense for his labors.
“And he who threshes ought to thresh in hope of receiving what is expected.” See his wisdom. From sowing he passes to threshing, and by this again indicates how great are the labors of teachers, who themselves both plow and thresh.
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Since the one who plows cannot yet gather anything, but must only labor, he grants him hope. But to the one who threshes he already grants the use of the fruits.
“He who threshes,” he says, “receives what is expected in hope.” Then, lest someone say, “Is this the recompense for such labors?” he adds, “in hope,” that is, of the future.
Thus the law about not muzzling the mouth of the ox means nothing other than this: laboring teachers must receive recompense.