The word(s) "duty" appears 132 time(s) in 121 verse(s) in Quran in Muhammad Pickthal translation.

(111) O ye who believe! Observe your duty to Allah. And let every soul look to that which it sendeth on before for the morrow. And observe your duty to Allah. Lo! Allah is Informed of what ye do.

(112) And if any of your wives have gone from you unto the disbelievers and afterward ye have your turn (of triumph), then give unto those whose wives have gone the like of that which they have spent, and keep your duty to Allah in Whom ye are believers.

(113) Obey Allah and obey His messenger; but if ye turn away, then the duty of Our messenger is only to convey (the message) plainly.

(114) So keep your duty to Allah as best ye can, and listen, and obey, and spend; that is better for your souls. And whoso is saved from his own greed, such are the successful.

(115) O Prophet! When ye (men) put away women, put them away for their (legal) period and reckon the period, and keep your duty to Allah, your Lord. Expel them not from their houses nor let them go forth unless they commit open immorality. Such are the limits (imposed by) Allah; and whoso transgresseth Allah's limits, he verily wrongeth his soul. Thou knowest not: it may be that Allah will afterward bring some new thing to pass.

(116) Then, when they have reached their term, take them back in kindness or part from them in kindness, and call to witness two just men among you, and keep your testimony upright for Allah. Whoso believeth in Allah and the Last Day is exhorted to act thus. And whosoever keepeth his duty to Allah, Allah will appoint a way out for him,

(117) And for such of your women as despair of menstruation, if ye doubt, their period (of waiting) shall be three months, along with those who have it not. And for those with child, their period shall be till they bring forth their burden. And whosoever keepeth his duty to Allah, He maketh his course easy for him.

(118) That is the commandment of Allah which He revealeth unto you. And whoso keepeth his duty to Allah, He will remit from him his evil deeds and magnify reward for him.

(119) Allah hath prepared for them stern punishment; so keep your duty to Allah, O men of understanding! O ye who believe! Now Allah hath sent down unto you a reminder,

(120) (Bidding you): Serve Allah and keep your duty unto Him and obey me,