The word(s) "fai" appears 219 time(s) in 200 verse(s) in Quran in Mohsin Khan translation.

(151) The good deed and the evil deed cannot be equal. Repel (the evil) with one which is better (i.e. Allah orders the faithful believers to be patient at the time of anger, and to excuse those who treat them badly) then verily he, between whom and you there was enmity, (will become) as though he was a close friend.

(152) And as for those who take as Auliya' (guardians, supporters, helpers, lords, gods, protectors) others besides Him [i.e. they take false deities other than Allah as protectors, and they worship them] - Allah is Hafiz (Protector, Watcher) over them (i.e. takes care of their deeds and will recompense them), and you (O Muhammad صلى الله عليه و سلم) are not a Wakil (guardian or a disposer of their affairs) over them (to protect their deeds).

(153) And in whatsoever you differ, the decision thereof is with Allah (He is the ruling Judge). (And say O Muhammad صلى الله عليه و سلم to these polytheists:) Such is Allah, my Lord in Whom I put my trust, and to Him I turn (in all of my affairs and) in repentance.

(154) So whatever you have been given is but (a passing) enjoyment for this worldly life, but that which is with Allah (Paradise) is better and more lasting for those who believe (in the Oneness of Allah - Islamic Monotheism) and put their trust in their Lord (concerning all of their affairs).

(155) And those who answer the Call of their Lord [i.e. to believe that He is the only One Lord (Allah), and to worship none but Him Alone], and perform As-Salat (Iqamat-as-Salat), and who (conduct) their affairs by mutual consultation, and who spend of what We have bestowed on them.

(156) And thus We have sent to you (O Muhammad صلى الله عليه و سلم) Ruh (a Revelation, and a Mercy) of Our Command. You knew not what is the Book, nor what is faith? But We have made it (this Qur'an) a light wherewith We guide whosoever of Our slaves We will. And verily, you (O Muhammad صلى الله عليه و سلم) are indeed guiding (mankind) to the Straight Path (i.e. Allah's Religion of Islamic Monotheism).

(157) The Lord of the heavens and the earth and all that is between them, if you (but) have a faith with certainty.

(158) So (it will be). And We shall marry them to Hur (fair female) with wide, lovely eyes.

(159) And in your creation, and what He scattered (through the earth) of moving (living) creatures are signs for people who have faith with certainty.

(160) This (Qur'an) is a clear insight and evidence for mankind, and a guidance and a mercy for people who have faith with certainty.