Bible Verses About Reciprocity

Yea, it hath been their good pleasure; and their debtors they are. For if the Gentiles have been made partakers of their spiritual things, they owe it to them also to minister unto them in carnal things.

If we sowed unto you spiritual things, is it a great matter if we shall reap your carnal things?

But let him that is taught in the word communicate unto him that teacheth in all good things.