The word(s) "mathna" appears 3 time(s) in 3 verse(s) in Quran.

(1) Wain khiftum alla tuqsitoo fee alyatama fainkihoo ma taba lakum mina alnnisai mathna wathulatha warubaAAa fain khiftum alla taAAdiloo fawahidatan aw ma malakat aymanukum thalika adna alla taAAooloo

(سورة النساء, An-Nisaa, Chapter #4, Verse #3)
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(2) Qul innama aAAithukum biwahidatin an taqoomoo lillahi mathna wafurada thumma tatafakkaroo ma bisahibikum min jinnatin in huwa illa natheerun lakum bayna yaday AAathabin shadeedin

(سورة سبإ, Saba, Chapter #34, Verse #46)
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(3) Alhamdu lillahi fatiri alssamawati waalardi jaAAili almalaikati rusulan olee ajnihatin mathna wathulatha warubaAAa yazeedu fee alkhalqi ma yashao inna Allaha AAala kulli shayin qadeerun

(سورة فاطر, Faatir, Chapter #35, Verse #1)
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