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

(41) Eat of that which Allah hath bestowed on you as food lawful and good, and keep your duty to Allah in Whom ye are believers.

(42) Obey Allah and obey the messenger, and beware! But if ye turn away, then know that the duty of Our messenger is only plain conveyance (of the message).

(43) There shall be no sin (imputed) unto those who believe and do good works for what they may have eaten (in the past). So be mindful of your duty (to Allah), and believe, and do good works; and again: be mindful of your duty, and believe; and once again: be mindful of your duty, and do right. Allah loveth the good.

(44) To hunt and to eat the fish of the sea is made lawful for you, a provision for you and for seafarers; but to hunt on land is forbidden you so long as ye are on the pilgrimage. Be mindful of your duty to Allah, unto Whom ye will be gathered.

(45) The duty of the messenger is only to convey (the message). Allah knoweth what ye proclaim and what ye hide.

(46) Say: The evil and the good are not alike even though the plenty of the evil attract thee. So be mindful of your duty to Allah, O men of understanding, that ye may succeed.

(47) But then, if it is afterwards ascertained that both of them merit (the suspicion of) sin, let two others take their place of those nearly concerned, and let them swear by Allah, (saying): Verily our testimony is truer than their testimony and we have not transgressed (the bounds of duty), for them indeed we should be of the evil-doers.

(48) Thus it is more likely that they will bear true witness or fear that after their oaths the oaths (of others) will be taken. So be mindful of your duty (to Allah) and hearken. Allah guideth not the froward folk.

(49) When the disciples said: O Jesus, son of Mary! Is thy Lord able to send down for us a table spread with food from heaven? He said: Observe your duty to Allah, if ye are true believers.

(50) Naught is the life of the world save a pastime and a sport. Better far is the abode of the Hereafter for those who keep their duty (to Allah). Have ye then no sense?