Imam Sadiq (PBUH):

Imam Sadiq (PBUH):

 

لا یَزالُ الدُّعاءُ مَحجوبا حَتّی یُصَلّی عَلی مُحَمَّدٍ وآلِ مُحَمَّدٍ.

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

Al-Kafi, Vol.2, P.491

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