The word(s) "mightier" appears 1 time(s) in 1 verse(s) in Quran in Saheeh International translation.

(1) And he had fruit, so he said to his companion while he was conversing with him, "I am greater than you in wealth and mightier in [numbers of] men."

(سورة الكهف, Al-Kahf, Chapter #18, Verse #34)
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