1 Corinthians 9:9-10

9God's Law that he gave to Moses says this: ‘Do not tie shut the mouth of your ox while it walks on your grain.’ But God's Law does not teach this only to help bulls.

10No, God wanted to help us too. That is why he gave this rule to Moses for his people. Any farmer who works hard to grow food should get some of the food for himself. He ploughs his fields and he prepares the seeds because he hopes to eat some of the food.