The word(s) "sin" appears 346 time(s) in 329 verse(s) in Quran in Abdullah Yusuf Ali translation.

(231) "Except Thy Servants amongst them, sincere and purified (by Thy Grace)."

(232) Verily it is We Who have revealed the Book to thee in Truth: so serve Allah, offering Him sincere devotion.

(233) Is it not to Allah that sincere devotion is due? But those who take for protectors other than Allah (say): "We only serve them in order that they may bring us nearer to Allah." Truly Allah will judge between them in that wherein they differ. But Allah guides not such as are false and ungrateful.

(234) He created you (all) from a single person: then created, of like nature, his mate; and he sent down for you eight head of cattle in pairs: He makes you, in the wombs of your mothers, in stages, one after another, in three veils of darkness. such is Allah, your Lord and Cherisher: to Him belongs (all) dominion. There is no god but He: then how are ye turned away (from your true Centre)?

(235) Say: "Verily, I am commanded to serve Allah with sincere devotion;

(236) Say: "It is Allah I serve, with my sincere (and exclusive) devotion:

(237) Say: "O my Servants who have transgressed against their souls! Despair not of the Mercy of Allah: for Allah forgives all sins: for He is Oft-Forgiving, Most Merciful.

(238) The Unbelievers will be led to Hell in crowd: until, when they arrive, there, its gates will be opened. And its keepers will say, "Did not messengers come to you from among yourselves, rehearsing to you the Signs of your Lord, and warning you of the Meeting of This Day of yours?" The answer will be: "True: but the Decree of Punishment has been proved true against the Unbelievers!"

(239) And thou wilt see the angels surrounding the Throne (Divine) on all sides, singing Glory and Praise to their Lord. The Decision between them (at Judgment) will be in (perfect) justice, and the cry (on all sides) will be, "Praise be to Allah, the Lord of the Worlds!"

(240) Who forgiveth sin, accepteth repentance, is strict in punishment, and hath a long reach (in all things). there is no god but He: to Him is the final goal.