Reciprocity: General Scriptures Concerning
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Romans 15:27
They were pleased to do it, and indeed they owe it to them. For if the Gentiles have shared in their spiritual blessings, they are obligated to minister to them with material blessings.
1 Corinthians 9:11
If we have sown spiritual seed among you, is it too much for us to reap a material harvest from you?
Galatians 6:6
Nevertheless, the one who receives instruction in the word must share in all good things with his instructor.