The word(s) "effect" appears 14 time(s) in 14 verse(s) in Quran in Muhammad Habib Shakir translation.

(11) (As for) those who disbelieve and turn away from Allah's way, He shall render their works ineffective.

(12) And (as for) those who disbelieve, for them is destruction and He has made their deeds ineffective.

(13) O you who believe! obey Allah and obey the Apostle, and do not make your deeds of no effect.

(14) Muhammad is the Apostle of Allah, and those with him are firm of heart against the unbelievers, compassionate among themselves; you will see them bowing down, prostrating themselves, seeking grace from Allah and pleasure; their marks are in their faces because of the effect of prostration; that is their description in the Taurat and their description in the Injeel; like as seed-produce that puts forth its sprout, then strengthens it, so it becomes stout and stands firmly on its stem, delighting the sowers that He may enrage the unbelievers on account of them; Allah has promised those among them who believe and do good, forgiveness and a great reward.