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

(421) Then which of the Blessings of your Lord will you both (jinn and men) deny?

(422) No Laghw (dirty, false, evil vain talk) will they hear therein, nor any sinful speech (like backbiting).

(423) And were persisting in great sin (joining partners in worship along with Allah, committing murder and other crimes)

(424) Know that the life of this world is only play and amusement, pomp and mutual boasting among you, and rivalry in respect of wealth and children. (It is) as the likeness of vegetation after rain, thereof the growth is pleasing to the tiller; afterwards it dries up and you see it turning yellow; then it becomes straw. But in the Hereafter (there is) a severe torment (for the disbelievers - evil-doers), and (there is) Forgiveness from Allah and (His) Good Pleasure (for the believers - good-doers). And the life of this world is only a deceiving enjoyment.

(425) Have you not seen those who were forbidden to hold secret counsels, and afterwards returned to that which they had been forbidden, and conspired together for sin and wrong doing and disobedience to the Messenger (Muhammad صلى الله عليه وسلم). And when they come to you, they greet you with a greeting wherewith Allah greets you not, and say within themselves: "Why should Allah punish us not for what we say?" Hell will be sufficient for them; they will burn therein. And worst indeed is that destination!

(426) O you who believe! When you hold secret counsel, do it not for sin and wrong-doing, and disobedience towards the Messenger (Muhammad صلى الله عليه وسلم), but do it for Al-Birr (righteousness) and Taqwa (virtues and piety); and fear Allah unto Whom you shall be gathered.

(427) O you who believe! When believing women come to you as emigrants, examine them; Allah knows best as to their Faith, then if you ascertain that they are true believers send them not back to the disbelievers. They are not lawful (wives) for the disbelievers nor are the disbelievers lawful (husbands) for them. But give them (the disbelievers) that (amount of money) which they have spent [as their Mahr] to them. And there will be no sin on you to marry them if you have paid their Mahr to them. Likewise hold not the disbelieving women as wives, and ask for (the return of) that which you have spent (as Mahr ) and let them (the disbelievers) ask back for that which they have spent. That is the Judgement of Allah, He judges between you. And Allah is All-Knowing, All-Wise.

(428) (If you do so) He will forgive you your sins, and admit you into Gardens under which rivers flow, and pleasant dwellings in 'Adn (Eden) Paradise; that is indeed the great success.

(429) And also (He will give you) another (blessing) which you love, - help from Allah (against your enemies) and a near victory. And give glad tidings (O Muhammad صلى الله عليه وسلم) to the believers.

(430) O you who believe (Muslims)! When the call is proclaimed for the Salat (prayer) on Friday (Jumu'ah prayer), come to the remembrance of Allah [Jumu'ah religious talk (Khutbah) and Salat (prayer)] and leave off business (and every other thing). That is better for you if you did but know!