It was narrated from Abdullah bin Abi Talhah, from his father, that The Messenger of Allah Peace be upon him came one day with a joyful expression on his face. He Peace be upon him said: “Jibril came to me and said: ( Allah Said) ‘Will it not please you, O Muhammad, (to know) that no one of your Ummah will send salah upon you but I will send salah upon him tenfold, and no one will send salams upon you but I will send salams upon him tenfold?”
Sunan Nasai, Vol 2, #1296 (Hasan)
It was narrated that Abdullah Radi Allahu Anhu said The Messenger of Allah Sallallahu Alaihi Wasallam said Allah has angels who travel around on Earth conveying to me the Salams of my Ummah.
Sunan Nasai ,Vol 2, 1283 (Sahih)
اللَّهُـمّ صَــــــلٌ علَےَ مُحمَّــــــــدْ و علَےَ آل مُحمَّــــــــدْ
Allahumma salli Ala Muhammad wa ala aali Muhammad