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

(441) And Fir'aun (Pharaoh), and those before him, and the cities overthrown [the towns of the people of [Lut (Lot)] committed sin.

(442) And the earth and the mountains shall be removed from their places, and crushed with a single crushing.

(443) So he shall be in a life, well-pleasing.

(444) None will eat it except the Khati'un (sinners, disbelievers, polytheists).

(445) Though they shall be made to see one another [(i.e. on the Day of Resurrection), there will be none but see his father, children and relatives, but he will neither speak to them nor will ask them for any help]. The Mujrim, (criminal, sinner, disbeliever) would desire to ransom himself from the punishment of that Day by his children,

(446) "He (Allah) will forgive you of your sins and respite you to an appointed term. Verily, the term of Allah when it comes, cannot be delayed, if you but knew."

(447) Because of their sins they were drowned, then were made to enter the Fire. And they found none to help them instead of Allah.

(448) 'And verily, there were men among mankind who took shelter with the males among the jinn, but they (jinn) increased them (mankind) in sin and transgression.

(449) 'And indeed when we heard the Guidance (this Qur'an), we believed therein (Islamic Monotheism), and whosoever believes in his Lord shall have no fear, either of a decrease in the reward of his good deeds or an increase in the punishment for his sins.

(450) Verily, the rising by night (for Tahajjud prayer) is very hard and most potent and good for governing oneself, and most suitable for (understanding) the Word (of Allah).