Sunan An Nasai
1064
It was narrated from Abu Hurairah that:
The Messenger of Allah (ﷺ) said: When the Imam says: 'Sami Allahu liman hamidah (Allah hears the one who praises Him),' then say: 'Rabbana wa lakal-hamd,' (Our Lord, and to You be the praise).' Whoever says..
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