The word(s) "thahiratan" appears 2 time(s) in 2 verse(s) in Quran.

(1) Alam taraw anna Allaha sakhkhara lakum ma fee alssamawati wama fee alardi waasbagha AAalaykum niAAamahu thahiratan wabatinatan wamina alnnasi man yujadilu fee Allahi bighayri AAilmin wala hudan wala kitabin muneerin

(سورة لقمان, Luqman, Chapter #31, Verse #20)
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(2) WajaAAalna baynahum wabayna alqura allatee barakna feeha quran thahiratan waqaddarna feeha alssayra seeroo feeha layaliya waayyaman amineena

(سورة سبإ, Saba, Chapter #34, Verse #18)
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