The word(s) "faileth" appears 6 time(s) in 6 verse(s) in Quran in Muhammad Pickthal translation.

(1) Our Lord! Lo! it is Thou Who gatherest mankind together to a Day of which there is no doubt. Lo! Allah faileth not to keep the tryst.

(2) Had it been possible for a Lecture to cause the mountains to move, or the earth to be torn asunder, or the dead to speak, (this Qur'an would have done so). Nay, but Allah's is the whole command. Do not those who believe know that, had Allah willed, He could have guided all mankind? As for those who disbelieve, disaster ceaseth not to strike them because of what they do, or it dwelleth near their home until the threat of Allah come to pass. Lo! Allah faileth not to keep the tryst.

(3) Moses said unto them: Woe unto you! Invent not a lie against Allah, lest He extirpate you by some punishment. He who lieth faileth miserably.

(4) And they will bid thee hasten on the Doom, and Allah faileth not His promise, but lo! a Day with Allah is as a thousand years of what ye reckon.

(5) It is a promise of Allah. Allah faileth not His promise, but most of mankind know not.

(6) But those who keep their duty to their Lord, for them are lofty halls with lofty halls above them, built (for them), beneath which rivers flow. (It is) a promise of Allah. Allah faileth not His promise.