Imam Sadiq (a):

Imam Sadiq (a):

 

لا یَزالُ الدُّعاءُ مَحجوبا حَتّی یُصَلّی عَلی مُحَمَّدٍ وآلِ مُحَمَّدٍ.

Prayer remains hidden (from being answered) untill blessing is sent upon Muhammad and the family of Muhammad.

al-Kafi, Vol.2, P.491

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