The salawat of Abu Hasan Zarrab Isfahani has been narrated by Shaykh Tusi and Sayyed ibn Tawoos.
Syed ibn Tawoos says, this salawat has been quoted from our Master Imam Mahdi (as). If you could not observe the post prayer rituals of Friday afternoon because of any excuse, never neglect this salawat.
Shaykh Tusi says in his book “Misbah al Mutahajjiya”, this salawat is quoted from Imam Mahdi (as). He gave it to Abu Hasan Zarrab Isfahani in Makkah.