The word(s) "ineffectual" appears 1 time(s) in 1 verse(s) in Quran in Muhammad Habib Shakir translation.

(1) This is Allah's guidance, He guides thereby whom He pleases of His servants; and if they had set up others (with Him), certainly what they did would have become ineffectual for them.

(سورة الأنعام, Al-An'aam, Chapter #6, Verse #88)
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