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

(291) It is no sin on them (the Prophet's wives, if they appear unveiled) before their fathers, or their sons, or their brothers, or their brother's sons, or the sons of their sisters, or their own (believing) women, or their (female) slaves. And (O ladies), fear (keep your duty to) Allah. Verily, Allah is Ever All-Witness over everything.

(292) Allah sends His Salat (Graces, Honours, Blessings, Mercy) on the Prophet (Muhammad صلى الله عليه وسلم), and also His angels (ask Allah to bless and forgive him). O you who believe! Send your Salat on (ask Allah to bless) him (Muhammad صلى الله عليه وسلم), and (you should) greet (salute) him with the Islamic way of greeting (salutation i.e. As-Salamu 'Alaikum ).

(293) And those who annoy believing men and women undeservedly, they bear (on themselves) the crime of slander and plain sin.

(294) He will direct you to do righteous good deeds and will forgive you your sins. And whosoever obeys Allah and His Messenger (صلى الله عليه وسلم), he has indeed achieved a great achievement (i.e. he will be saved from the Hell-fire and will be admitted to Paradise).

(295) Those who disbelieve say: "Shall we direct you to a man (Muhammad صلى الله عليه وسلم) who will tell you (that) when you have become fully disintegrated into dust with full dispersion, then you will be created (again) anew?"

(296) See they not what is before them and what is behind them, of the heaven and the earth? If We will, We shall sink the earth with them, or cause a piece of the heaven to fall upon them. Verily, in this is a sign for every slave who turns to Allah in repentance (i.e. the one who believes in the Oneness of Allah and performs deeds of His obedience and always begs His Pardon).

(297) They worked for him as he desired, (making) high rooms, images, basins as large as reservoirs, and (cooking) cauldrons fixed (in their places). "Work you, O family of Dawud (David), with thanks!" But few of My slaves are grateful.

(298) Say (O Muhammad صلى الله عليه وسلم to polytheists, pagans) "You will not be asked about our sins, nor shall we be asked of what you do."

(299) And those who were arrogant will say to those who were deemed weak: "Did we keep you back from guidance after it had come to you? Nay, but you were Mujrimun (polytheists, sinners, disbelievers, criminals)."

(300) Say (to them O Muhammad صلى الله عليه وسلم): "I exhort you to one (thing) only: that you stand up for Allah's sake in pairs and singly, and reflect (within yourselves the life history of the Prophet صلى الله عليه وسلم): there is no madness in your companion (Muhammad صلى الله عليه وسلم). He is only a warner to you in face of a severe torment."