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Muslim (384)وَيُصَلِّي عَلَى النَّبِيِّ ﷺ بَعْدَ فَرَاغِهِ مِنَ إِجَابَةِ الْمُؤَذِّنِ
Wa yusalli 'alan-Nabiyyi ﷺ ba'da faraghihi min ijabatil-mu'adhdhin.
Then one sends prayers upon the Prophet ﷺ after finishing repeating after the muezzin.
Virtue
Whoever sends prayers upon the Prophet ﷺ once, Allah sends prayers upon him ten times.
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