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

(171) So, when they despaired of him, they held a conference in private. The eldest among them said: "Know you not that your father did take an oath from you in Allah's Name, and before this you did fail in your duty with Yusuf (Joseph)? Therefore I will not leave this land until my father permits me, or Allah decides my case (by releasing Benjamin) and He is the Best of the judges.

(172) And he turned away from them and said: "Alas, my grief for Yusuf (Joseph)!" And he lost his sight because of the sorrow that he was suppressing.

(173) They said: "Are you indeed Yusuf (Joseph)?" He said: "I am Yusuf (Joseph), and this is my brother (Benjamin). Allah has indeed been gracious to us. Verily, he who fears Allah with obedience to Him (by abstaining from sins and evil deeds, and by performing righteous good deeds), and is patient, then surely, Allah makes not the reward of the Muhsinun (good-doers - see V.2:112) to be lost."

(174) They said: "By Allah! Indeed Allah has preferred you above us, and we certainly have been sinners."

(175) They said: "O our father! Ask Forgiveness (from Allah) for our sins, indeed we have been sinners."

(176) And We sent not before you (as Messengers) any but men unto whom We revealed, from among the people of the townships. Have they not travelled in the land and seen what was the end of those who were before them? And verily, the home of the Hereafter is the best for those who fear Allah and obey Him (by abstaining from sins and evil deeds, and by performing righteous good deeds). Do you not then understand?

(177) (They were reprieved) until, when the Messengers gave up hope and thought that they were denied (by their people), then came to them Our Help, and whomsoever We willed were rescued. And Our punishment cannot be warded off from the people who are Mujrimun (criminals, sinners, disbelievers, polytheists).

(178) And in the earth are neighbouring tracts, and gardens of vines, and green crops (fields), and date-palms, growing into two or three from a single stem root, or otherwise (one stem root for every palm), watered with the same water; yet some of them We make more excellent than others to eat. Verily, in these things there are Ayat (proofs, evidence, lessons, signs) for the people who understand.

(179) For him (each person), there are angels in succession, before and behind him. They guard him by the Command of Allah. Verily! Allah will not change the (good) condition of a people as long as they do not change their state (of goodness) themselves (by committing sins and by being ungrateful and disobedient to Allah). But when Allah wills a people's punishment, there can be no turning back of it, and they will find besides Him no protector.

(180) And those who join that which Allah has commanded to be joined (i.e. they are good to their relatives and do not sever the bond of kinship), and fear their Lord, and dread the terrible reckoning (i.e. abstain from all kinds of sins and evil deeds which Allah has forbidden and perform all kinds of good deeds which Allah has ordained).