For it is written in the law of Moses, You shall not muzzle the mouth of the ox that treads out the grain. Does God care for oxen?
All Commentaries on 1 Corinthians 9:9 Go To 1 Corinthians 9
John Chrysostom
AD 407
Why does Paul mention this, when he could have used the example of the priests? The reason is that he wanted to prove his case beyond any shadow of doubt. If God cares about oxen, how much more will he care about the labor of teachers? Homilies on the Epistles of Paul to the Corinthians