Sayyiduna Abdullah bin Abi Talhah (may Allah be pleased with him) narrates from his father that one day the Messenger of Allah (peace and blessings be upon him) came, and joy was apparent on his (peace and blessings be upon him) face. It was said: "O Messenger of Allah, we see a joy on your face that we had not seen before." He (peace and blessings be upon him) said: "An angel came to me and said: 'Your Lord says to you: Are you not pleased that no one from your Ummah sends blessings upon you except that I send mercy upon him ten times, and no one greets you with peace except that I send peace upon him ten times?' I said: 'Certainly!'"
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4707