Bible Verses About Reciprocity

For it hath pleased them: and they are their debtors. For, if the Gentiles have been made partakers of their spiritual things, they ought also in carnal things to minister to them.

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

And let him that is instructed in the word communicate to him that instructeth him, in all good things.