Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Abu Bakr Siddiq (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Send abundant blessings upon me, for Allah Almighty has appointed an angel at my grave. When a member of my Ummah sends blessings upon me, that angel says to me: O Muhammad! So-and-so, son of so-and-so, has just sent blessings upon you."