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

(121) So on that Day no excuse of theirs will avail those who did wrong (by associating partners in worship with Allah, and by denying the Day of Resurrection), nor will they be allowed (then) to return to seek Allah's Pleasure (by having Islamic faith with righteous deeds and by giving up polytheism, sins and crimes with repentance).

(122) So be patient (O Muhammad صلى الله عليه وسلم). Verily, the Promise of Allah is true; and let not those who have no certainty of faith, discourage you from conveying Allah's Message (which you are obliged to convey).

(123) Those who perform As-Salat (Iqamat-as-Salat) and give Zakat and they have faith in the Hereafter with certainty.

(124) See you not (O men) that Allah has subjected for you whatsoever is in the heavens and whatsoever is in the earth, and has completed and perfected His Graces upon you, (both) apparent (i.e. Islamic Monotheism, and the lawful pleasures of this world, including health, good looks, etc.) and hidden [i.e. One's faith in Allah (of Islamic Monotheism) knowledge, wisdom, guidance for doing righteous deeds, and also the pleasures and delights of the Hereafter in Paradise]? Yet of mankind is he who disputes about Allah without knowledge or guidance or a Book giving light!

(125) He manages and regulates (every) affair from the heavens to the earth; then it (affair) will go up to Him, in one Day, the space whereof is a thousand years of your reckoning (i.e. reckoning of our present world's time).

(126) And put your trust in Allah, and Sufficient is Allah as a Wakil (Trustee, or Disposer of affairs).

(127) Call them (adopted sons) by (the names of) their fathers: that is more just with Allah. But if you know not their father's (names, call them) your brothers in faith and Mawalikum (your freed slaves). And there is no sin on you concerning that in which you made a mistake , except in regard to what your hearts deliberately intend. And Allah is Ever Oft-Forgiving, Most Merciful.

(128) And when the believers saw Al-Ahzab (the Confederates), they said: "This is what Allah and His Messenger (Muhammad صلى الله عليه وسلم) had promised us; and Allah and His Messenger (Muhammad صلى الله عليه وسلم) had spoken the truth. And it only added to their faith and to their submissiveness (to Allah).

(129) And obey not the disbelievers and the hypocrites, and harm them not (in revenge for their harming you till you are ordered). And put your trust in Allah, and Sufficient is Allah as a Wakil (Trustee, or Disposer of affairs). [Tafsir Al-Qurtubi]

(130) Indeed there was for Saba' (Sheba) a sign in their dwelling-place - two gardens on the right hand and on the left; (and it was said to them:) "Eat of the provision of your Lord, and be grateful to Him." A fair land and an Oft-Forgiving Lord!