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

(1) This is the Book (the Qur'an), whereof there is no doubt, a guidance to those who are Al-Muttaqun [the pious believers of Islamic Monotheism who fear Allah much (abstain from all kinds of sins and evil deeds which He has forbidden) and love Allah much (perform all kinds of good deeds which He has ordained)].

(2) And (remember) when We said: "Enter this town (Jerusalem) and eat bountifully therein with pleasure and delight wherever you wish, and enter the gate in prostration (or bowing with humility) and say: 'Forgive us,' and We shall forgive you your sins and shall increase (reward) for the good-doers."

(3) And (remember) when you said, "O Musa (Moses)! We cannot endure one kind of food. So invoke your Lord for us to bring forth for us of what the earth grows, its herbs, its cucumbers, its Fum (wheat or garlic), its lentils and its onions." He said, "Would you exchange that which is better for that which is lower? Go you down to any town and you shall find what you want!" And they were covered with humiliation and misery, and they drew on themselves the Wrath of Allah. That was because they used to disbelieve the Ayat (proofs, evidence, verses, lessons, signs, revelations etc.) of Allah and killed the Prophets wrongfully. That was because they disobeyed and used to transgress the bounds (in their disobedience to Allah, i.e. commit crimes and sins).

(4) They said, "Call upon your Lord for us to make plain to us its colour." He said, "He says, 'It is a yellow cow, bright in its colour, pleasing to the beholders.' "

(5) Yes! Whosoever earns evil and his sin has surrounded him, they are dwellers of the Fire (i.e. Hell); they will dwell therein forever.

(6) After this, it is you who kill one another and drive out a party of you from their homes, assist (their enemies) against them, in sin and transgression. And if they come to you as captives, you ransom them, although their expulsion was forbidden to you. Then do you believe in a part of the Scripture and reject the rest? Then what is the recompense of those who do so among you, except disgrace in the life of this world, and on the Day of Resurrection they shall be consigned to the most grievous torment. And Allah is not unaware of what you do.

(7) Yes, but whoever submits his face (himself) to Allah (i.e. follows Allah's Religion of Islamic Monotheism) and he is a Muhsin then his reward is with his Lord (Allah), on such shall be no fear, nor shall they grieve. [See Tafsir Ibn Kathir ].

(8) And (remember) when Ibrahim (Abraham) and (his son) Isma'il (Ishmael) were raising the foundations of the House (the Ka'bah at Makkah), (saying), "Our Lord! Accept (this service) from us. Verily! You are the All-Hearer, the All-Knower."

(9) Say (O Muhammad صلى الله عليه وسلم to the Jews and Christians), "Dispute you with us about Allah while He is our Lord and your Lord? And we are to be rewarded for our deeds and you for your deeds. And we are sincere to Him [in worship and obedience (i.e. we worship Him Alone and none else, and we obey His Orders)]."

(10) And from wheresoever you start forth (for prayers), turn your face in the direction of Al-Masjid-Al-Haram (at Makkah), and wheresoever you are, turn your faces towards it (when you pray) so that men may have no argument against you except those of them that are wrong-doers, so fear them not, but fear Me! - And so that I may complete My Blessings on you and that you may be guided.