The word(s) "sin" appears 521 time(s) in 480 verse(s) in Quran in Mohsin Khan translation.

(91) Why do not the rabbis and the religious learned men forbid them from uttering sinful words and from eating illegal things. Evil indeed is that which they have been performing.

(92) And if only the people of the Scripture (Jews and Christians) had believed (in Muhammad صلى الله عليه وسلم) and warded off evil (sin, ascribing partners to Allah) and had become Al-Muttaqun (the pious - See V.2:2) We would indeed have expiated from them their sins and admitted them to Gardens of pleasure (in Paradise).

(93) Those among the Children of Israel who disbelieved were cursed by the tongue of Dawud (David) and 'Îsa (Jesus), son of Maryam (Mary). That was because they disobeyed (Allah and the Messengers) and were ever transgressing beyond bounds.

(94) They used not to forbid one another from Al-Munkar (wrong, evil-doing, sins, polytheism, disbelief) which they committed. Vile indeed was what they used to do.

(95) So because of what they said, Allah rewarded them Gardens under which rivers flow (in Paradise), they will abide therein forever. Such is the reward of Al-Muhsinun (the good-doers).

(96) Those who believe and do righteous good deeds, there is no sin on them for what they ate (in the past), if they fear Allah (by keeping away from His forbidden things), and believe and do righteous good deeds, and again fear Allah and believe, and once again fear Allah and do good deeds with Ihsan (perfection). And Allah loves the good-doers.

(97) O you who believe! When death approaches any of you, and you make a bequest, (then take) the testimony of two just men of your own folk or two others from outside, while you are travelling through the land and death befalls on you. Detain them both after As-Salat (the prayer), (then) if you are in doubt (about their truthfulness), let them both swear by Allah (saying): "We wish not for any worldly gain in this, even though he (the beneficiary) be our near relative. We shall not hide Testimony of Allah, for then indeed we should be of the sinful."

(98) If then it gets known that these two had been guilty of sin, let two others stand forth in their places, nearest in kin from among those who claim a lawful right. Let them swear by Allah (saying): "We affirm that our testimony is truer than that of both of them, and that we have not trespassed (the truth), for then indeed we should be of the wrong-doers."

(99) Have they not seen how many a generation before them We have destroyed whom We had established on the earth such as We have not established you? And We poured out on them rain from the sky in abundance, and made the rivers flow under them. Yet We destroyed them for their sins, and We created after them other generations.

(100) And warn therewith (the Qur'an) those who fear that they will be gathered before their Lord, when there will be neither a protector nor an intercessor for them besides Him, so that they may fear Allah and keep their duty to Him (by abstaining from committing sins and by doing all kinds of good deeds which He has ordained).