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

(131) Then after them succeeded an (evil) generation, which inherited the Book, but they chose (for themselves) the goods of this low life (evil pleasures of this world) saying (as an excuse): "(Everything) will be forgiven to us." And if (again) the offer of the like (evil pleasures of this world) came their way, they would (again) seize them (would commit those sins). Was not the covenant of the Book taken from them that they would not say about Allah anything but the truth? And they have studied what is in it (the Book). And the home of the Hereafter is better for those who are Al-Muttaqun (the pious - See V.2:2). Do not you then understand?

(132) Or lest you should say: "It was only our fathers afortime who took others as partners in worship along with Allah, and we were (merely their) descendants after them; will You then destroy us because of the deeds of men who practised Al-Batil (i.e. polytheism and committing crimes and sins, invoking and worshipping others besides Allah)?" (Tafsir At-Tabari).

(133) It is He Who has created you from a single person (Adam), and (then) He has created from him his wife [Hawwa' (Eve)], in order that he might enjoy the pleasure of living with her. When he (a polytheist from Adam's offspring - as stated by Ibn Kathir in his Tafsir) had sexual relation with her (the polytheist's wife), she became pregnant and she carried it about lightly. Then when it became heavy, they both invoked Allah, their Lord (saying): "If You give us a Salih (good in every aspect) child, we shall indeed be among the grateful."

(134) That He might cause the truth to triumph and bring falsehood to nothing, even though the Mujrimun (disbelievers, polytheists, sinners, criminals) hate it.

(135) O you who believe! If you obey and fear Allah, He will grant you Furqan [(a criterion to judge between right and wrong), or (Makhraj, i.e. a way for you to get out from every difficulty)], and will expiate for you your sins, and forgive you; and Allah is the Owner of the Great Bounty.

(136) Similar to the behaviour of the people of Fir'aun (Pharaoh), and of those before them - they rejected the Ayat (proofs, verses, etc.) of Allah, so Allah punished them for their sins. Verily, Allah is All-Strong, Severe in punishment.

(137) Similar to the behaviour of the people of Fir'aun (Pharaoh), and those before them. They belied the Ayat (proofs, evidence, verses, lessons, signs, revelations, etc.) of their Lord, so We destroyed them for their sins, and We drowned the people of Fir'aun (Pharaoh) for they were all Zalimun (polytheists and wrong-doers).

(138) Make no excuse; you disbelieved after you had believed. If We pardon some of you, We will punish others amongst you because they were Mujrimun (disbelievers, polytheists, sinners, criminals.).

(139) So let them laugh a little and (they will) cry much as a recompense of what they used to earn (by committing sins).

(140) There is no blame on those who are weak or ill or who find no resources to spend [in holy fighting (Jihad)], if they are sincere and true (in duty) to Allah and His Messenger. No ground (of complaint) can there be against the Muhsinun (good-doers - See the footnote of V.9:120). And Allah is Oft-Forgiving, Most Merciful.