Bible Verses About Reciprocity

It hath pleased them verily; and their debtors they are. For if the Gentiles have been made partakers of their spiritual things, their duty is also to minister unto them in carnal things.

If we have sown unto you spiritual things, is it a great thing if we shall reap your carnal things?

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