Jami at Tirmidhi
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Sa'd bin Abi Waqqas narrated that :
Allah's Messenger said: Whoever says, when he hears the Mu'adh-dhin: (Wa Ana Ashadu An La Ilaha Illallah, Wahdahu La Sharika Lahu, Wa Anna Muhammadan Abduhu Wa Rasuluhu, Radittu Billahi Rabban Wa Bil-Islam..
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