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

(431) (And remember) the Day when He will gather you (all) on the Day of Gathering, - that will be the Day of mutual loss and gain (i.e. loss for the disbelievers as they will enter the Hell-fire and gain for the believers as they will enter Paradise). And whosoever believes in Allah and performs righteous good deeds, He will expiate from him his sins, and will admit him to Gardens under which rivers flow (Paradise) to dwell therein forever; that will be the great success.

(432) That is the Command of Allah, which He has sent down to you; and whosoever fears Allah and keeps his duty to Him, He will expiate from him his sins, and will enlarge his reward.

(433) It may be if he divorced you (all) that his Lord will give him instead of you, wives better than you - Muslims (who submit to Allah), believers, obedient (to Allah), turning to Allah in repentance, worshipping Allah sincerely, given to fasting or emigrants (for Allah's sake), previously married and virgins.

(434) O you who believe! Turn to Allah with sincere repentance! It may be that your Lord will expiate from you your sins, and admit you into Gardens under which rivers flow (Paradise) - the Day that Allah will not disgrace the Prophet (Muhammad صلى الله عليه وسلم) and those who believe with him. Their Light will run forward before them and (with their Records - Books of deeds) in their right hands. They will say: "Our Lord! Keep perfect our Light for us [and do not put it off till we cross over the Sirat (a slippery bridge over the Hell) safely] and grant us forgiveness. Verily, You are Able to do all things."

(435) Then they will confess their sin. So, away with the dwellers of the blazing Fire!

(436) Do you feel secure that He, Who is over the heaven (Allah), will not cause the earth to sink with you, and then it should quake?

(437) Say (O Muhammad صلى الله عليه وسلم): "Tell me! If (all) your water were to sink away, who then can supply you with flowing (spring) water?"

(438) Hinderer of the good, transgressor, sinful,

(439) So they departed, conversing in secret low tones (saying):

(440) We hope that our Lord will give us in exchange a better (garden) than this. Truly, we turn to our Lord (wishing for good that He may forgive our sins and reward us in the Hereafter).