We found "Do your duty" used in 2 sacred songs, each carrying a unique message of faith.
Do your duty
...Only watch and pray;
Do your duty nobly,
Heart and hand unite,...
Only watch and pray;
Do your duty nobly,
Heart and hand unite,
...Others can not fill;
You must do your duty,
Do it with a will....
Others can not fill;
You must do your duty,
Do it with a will.
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