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

(321) "I had no knowledge of the chiefs (angels) on high when they were disputing and discussing (about the creation of Adam).

(322) Verily We have sent down the Book to you (O Muhammad صلى الله عليه وسلم) in truth: So worship Allah (Alone) by doing religious deeds sincerely for Allah's sake only.

(323) He created you (all) from a single person (Adam); then made from him his wife [Hawwa' (Eve)]. And He has sent down for you of cattle eight pairs (of the sheep, two, male and female; of the goats, two, male and female; of the oxen, two, male and female; and of the camels, two, male and female). He creates you in the wombs of your mothers: creation after creation in three veils of darkness. Such is Allah your Lord. His is the kingdom. La ilaha illa Huwa (none has the right to be worshipped but He). How then are you turned away?

(324) Say (O Muhammad صلى الله عليه وسلم): "Verily I am commanded to worship Allah (Alone) by obeying Him and doing religious deeds sincerely for His sake only.

(325) Say (O Muhammad صلى الله عليه وسلم): "Allah Alone I worship by doing religious deeds sincerely for His sake only (and not to show off, and not to set up rivals with Him in worship.)"

(326) They shall have all that they will desire with their Lord. That is the reward of Muhsinun (good-doers - see the footnote of V.9:120).

(327) Say: "O 'Ibadi (My slaves) who have transgressed against themselves (by committing evil deeds and sins)! Despair not of the Mercy of Allah: verily, Allah forgives all sins. Truly He is Oft-Forgiving, Most Merciful.

(328) Or (lest) he should say when he sees the torment: "If only I had another chance (to return to the world), then I should indeed be among the Muhsinun (good-doers - See V.2:112)."

(329) The Forgiver of sin, the Acceptor of repentance, the Severe in punishment, the Bestower (of favours). La ilaha illa Huwa (none has the right to be worshipped but He), to Him is the final return.

(330) "And save them from (the punishment, for what they did of) the sins, and whomsoever You save from (the punishment for what he did of) the sins (i.e. pardon him) that Day, him verily, You have taken into mercy." And that is the supreme success.