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

(271) And among His Signs is that the heaven and the earth stand by His Command. Then afterwards when He will call you by a single call, behold, you will come out from the earth (i.e. from your graves for reckoning and recompense).

(272) And when harm touches men, they cry sincerely only to their Lord (Allah), turning to Him in repentance; but when He gives them a taste of His Mercy, behold, a party of them associates partners in worship with their Lord.

(273) And when We cause mankind to taste of mercy, they rejoice therein; but when some evil afflicts them because of (evil deeds and sins) that their (own) hands have sent forth, behold, they are in despair!

(274) Evil (sins and disobedience to Allah) has appeared on land and sea because of what the hands of men have earned (by oppression and evil deeds), that He (Allah) may make them taste a part of that which they have done, in order that they may return (by repenting to Allah, and begging His Pardon).

(275) Whosoever disbelieves will suffer from his disbelief, and whosoever does righteous good deeds (by practising Islamic Monotheism), then such will prepare a good place (in Paradise) for themselves (and will be saved by Allah from His Torment).

(276) And indeed We did send Messengers before you (O Muhammad صلى الله عليه وسلم) to their own peoples. They came to them with clear proofs, then, We took vengeance on those who committed crimes (disbelief, setting partners in worship with Allah, sins); and (as for) the believers, it was incumbent upon Us to help (them).

(277) And on the Day that the Hour will be established, the Mujrimun (criminals, disbelievers, polytheists, sinners) will swear that they stayed not but an hour - thus were they ever deluded [away from the truth (i.e. they used to tell lies and take false oaths, and turn away from the truth) in this life of the world)]

(278) So on that Day no excuse of theirs will avail those who did wrong (by associating partners in worship with Allah, and by denying the Day of Resurrection), nor will they be allowed (then) to return to seek Allah's Pleasure (by having Islamic Faith with righteous deeds and by giving up polytheism, sins and crimes with repentance).

(279) A guide and a mercy for the Muhsinun (good-doers).

(280) And of mankind is he who purchases idle talks (i.e. music, singing, etc.) to mislead (men) from the Path of Allah without knowledge, and takes it (the Path of Allah, or the Verses of the Qur'an) by way of mockery. For such there will be a humiliating torment (in the Hell-fire).