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

(91) O Prophet! Keep thy duty to Allah and obey not the disbelievers and the hypocrites. Lo! Allah is Knower, Wise.

(92) O ye wives of the Prophet! Ye are not like any other women. If ye keep your duty (to Allah), then be not soft of speech, lest he in whose heart is a disease aspire (to you), but utter customary speech.

(93) It is no sin for them (thy wives) to converse freely) with their fathers, or their sons, or their brothers, or their brothers' sons, or the sons of their sisters or of their own women, or their slaves. O women! Keep your duty to Allah. Lo! Allah is ever Witness over all things.

(94) O ye who believe! Guard your duty to Allah, and speak words straight to the point;

(95) And our duty is but plain conveyance (of the message).

(96) Say: O My bondmen who believe! Observe your duty to your Lord. For those who do good in this world there is good, and Allah's earth is spacious. Verily the steadfast will be paid their wages without stint.

(97) But those who keep their duty to their Lord, for them are lofty halls with lofty halls above them, built (for them), beneath which rivers flow. (It is) a promise of Allah. Allah faileth not His promise.

(98) And those who keep their duty to their Lord are driven unto the Garden in troops till, when they reach it, and the gates thereof are opened, and the warders thereof say unto them: Peace be unto you! Ye are good, so enter ye (the Garden of delight), to dwell therein;

(99) And We delivered those who believed and used to keep their duty to Allah.

(100) When Jesus came with clear proofs (of Allah's Sovereignty), he said: I have come unto you with wisdom, and to make plain some of that concerning which ye differ. So keep your duty to Allah, and obey me.