'Reluctantly' in the Bible

For if I do this work of my own free will, then I have a reward; but if it is not of my will [but by God’s choosing], I have been entrusted with a [sacred] stewardship.

Let each one give [thoughtfully and with purpose] just as he has decided in his heart, not grudgingly or under compulsion, for God loves a cheerful giver [and delights in the one whose heart is in his gift].