By this isnad from Muhammad b. Abi `Umayr from `Abdullah b. Sinan from Abi `Abdillah al-Sadiq . He said:

The Messenger of Allah (s) said one day to `Ali : Shall I not give you glad tidings? So, he said: Of course, may my mother and my father be your sacrifice. Surely, you do not stop giving glad tidings with every good thing. So, he said: Gabriel informed me of something astonishing. So, `Ali said to him: What did he inform you of, O Messenger of Allah? He said: He informed me that, when a man from my Nation blesses me and follows it up with blessing my Ahl al-Bayt, the gates of heaven open for him, and the angels bless him seventy times. If he is an erring sinner, the sins will shed from him just as leaves shed from a tree. Furthermore, Allah says: “I am at your service, My servant”; and Allah says to His angels: “O My angels! You bless him seventy times, and I bless him seven hundred times.” If he blesses me without following it up with blessing my Ahl al-Bayt, there will be seventy veils between him and heaven; and Allah will say: “I am not at your service. O angels! Do not bring up his supplications until he follows the Prophet up with his progeny [in blessing].” So, it will remain suspended until he follows me up with my Ahl al-Bayt.