Hazrat Anas رضي الله عنه reports that Sayyiduna Rasoolullah صلى الله عليه وسلم said; “In whosoever’s presence my name is mentioned he should recite salaat on me, and whosoever recites salaat on me once, on him shall Allah send ten mercies, and forgive him ten sins and also raise his rank ten times.”
(Ahmad, Nasa’ee and Ibn Hibbaan)
Allamah Munziry رحمه الله mentions the same Hadīth on the authority of Hazrat Barra رضي الله عنه with only one addition; i.e. “And it shall be for him as if he had freed ten slaves.” This Hadīth according to Tabraani is as follows; “Whoever recites salaat on me once, on him shall Allah send ten mercies; whoever recites it ten times, on him shall Allah send one hundred salaat; and whoever recites one hundred salaat, for him shall Allah write on his forehead:
براءة من النفاق وبراءة من النار
Immunity from hypocrisy and immunity from the fire of hell.
Such a person, free of hypocrisy and safe from the fire of Jahannum, shall be raised up on the Day of Qiyaamah with the martyrs. Allamah Sakhaawi رحمه الله quotes another report by Hazrat Abu Hurairah رضي الله عنه; “Whoever recites salaat on me ten times, on him shall Allah send one hundred mercies; and whoever recites it one hundred times, on him shall Allah send one thousand mercies; and whoever out of love and devotion increases his salaat beyond that, for him shall I be an intercessor and a witness on the Day of Qiyaamah.”
(SOURCE: VIRTUES OF SALAAT ALAN NABI صلى الله عليه وسلم by Sheikhul Hadīth Hazrat Moulana Muhammad Zakariyya Sahib رحمه الله)