The word(s) "purifies" appears 5 time(s) in 4 verse(s) in Quran in Mohsin Khan translation.

(1) O you who believe! Follow not the footsteps of Shaitan (Satan). And whosoever follows the footsteps of Shaitan (Satan), then, verily he commands Al-Fahsha' [i.e. to commit indecency (illegal sexual intercourse)], and Al-Munkar [disbelief and polytheism (i.e. to do evil and wicked deeds; and to speak or to do what is forbidden in Islam)]. And had it not been for the Grace of Allah and His Mercy on you, not one of you would ever have been pure from sins. But Allah purifies (guides to Islam) whom He wills, and Allah is All-Hearer, All-Knower.

(2) And no bearer of burdens shall bear another's burden; and if one heavily laden calls another to (bear) his load, nothing of it will be lifted even though he be near of kin. You (O Muhammad صلى الله عليه وسلم) can warn only those who fear their Lord unseen and perform As-Salat (Iqamat-as-Salat). And he who purifies himself (from all kinds of sins), then he purifies only for the benefit of his ownself. And to Allah is the (final) Return (of all).

(3) Indeed whosoever purifies himself (by avoiding polytheism and accepting Islamic Monotheism) shall achieve success,

(4) Indeed he succeeds who purifies his ownself (i.e. obeys and performs all that Allah ordered, by following the true Faith of Islamic Monotheism and by doing righteous good deeds).