1 Corinthians 9:10

or saith he it assuredly for our sake? Yea, for our sake it was written: because he that ploweth ought to plow in hope, and he that thresheth, to thresh in hope of partaking.

'for our sake it was written' -'Surely we are included!' (Phi) 'Paul asserts that God does not legislate for oxen and forget men.' (McGarvey p. 91) 'Paul is saying that the law was written for man's benefit; after all, oxen cannot read.' (Willis p. 288)

And if this was the command given to Israelites concerning the "treatment" of their oxen, then how much more it applied to their treatment of their fellowman.

'he that ploweth..he that thresheth' -two specific groups of labors that this principle applies to.

'ought to plow..thresh..in hope' -i.e. of enjoying the fruits of their labors, share in the material benefits of their labors.