NT.filter - nkjv duty:

nkjv@Luke:17:10 @ So likewise you, when you have done all those things which you are commanded, say, "We are unprofitable servants. We have done what was our duty to do."'

nkjv@Romans:15:27 @ It pleased them indeed, and they are their debtors. For if the Gentiles have been partakers of their spiritual things, their duty is also to minister to them in material things.