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

(1) FalaAAallaka tarikun baAAda ma yooha ilayka wadaiqun bihi sadruka an yaqooloo lawla onzila AAalayhi kanzun aw jaa maAAahu malakun innama anta natheerun waAllahu AAala kulli shayin wakeelun

(سورة هود, Hud, Chapter #11, Verse #12)
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(2) Walaqad naAAlamu annaka yadeequ sadruka bima yaqooloona

(سورة الحجر, Al-Hijr, Chapter #15, Verse #97)
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