The word(s) "fail" appears 34 time(s) in 34 verse(s) in Quran in Muhammad Pickthal translation.

(21) And faces humble themselves before the Living, the Eternal. And he who beareth (a burden of) wrongdoing is indeed a failure (on that day).

(22) 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.

(23) And We shall take out from every nation a witness and We shall say: Bring your proof. Then they will know that Allah hath the Truth, and all that they invented will have failed them.

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

(25) 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.

(26) And verily it hath been revealed unto thee as unto those before thee (saying): If thou ascribe a partner to Allah thy work will fail and thou indeed wilt be among the losers.

(27) Beside Allah? They say: They have failed us; but we used not to pray to anything before. Thus doth Allah send astray the disbelievers (in His guidance).

(28) And those to whom they used to cry of old have failed them, and they perceive they have no place of refuge.

(29) Then why did those whom they had chosen for gods as a way of approach (unto Allah) not help them? Nay, but they did fail them utterly. And (all) that was their lie, and what they used to invent.

(30) Nay, but the Hour (of doom) is their appointed tryst, and the Hour will be more wretched and more bitter (than their earthly failure).