The word(s) "najas" appears 2 time(s) in 2 verse(s) in Quran in Mohsin Khan translation.

(1) O you who believe (in Allah's Oneness and in His Messenger Muhammad صلى الله عليه وسلم)! Verily, the Mushrikun (polytheists, pagans, idolaters, disbelievers in the Oneness of Allah, and in the Message of Muhammad صلى الله عليه وسلم) are najasun (impure). So let them not come near Al-Masjidal-Haram (at Makkah) after this year; and if you fear poverty, Allah will enrich you if He wills, out of His Bounty. Surely, Allah is All-Knowing, All-Wise.

(2) They will swear by Allah to you (Muslims) when you return to them, that you may turn away from them. So turn away from them. Surely, they are Rijs [i.e. najas (impure) because of their evil deeds], and Hell is their dwelling place - a recompense for that which they used to earn.