Sunan An Nasai
680
It was narrated from Sa'd bin Abi Waqqas that the Messenger of Allah (ﷺ) said:
Whoever says, when he hears the Mu'adhdhin: 'Ashhadu an la ilaha illallah wahdahu la sharika lahu wa anna Muhammadan 'abduhu wa Rasuluhu, raditu Billahi Rabban, wa..
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