Hazrat Asim r.a. bin Ubaidullah, Allah be pleased with him, said:
“I heard Abdullah bin Amir bin Rabi‘ah narrating from his father that the Prophet, peace and blessings of Allah be upon him, said, ‘There is no Muslim who sends peace and blessings upon me, but the angels will send peace and blessings upon him as long as he sends peace and blessings upon me. So let a person do a little of that or a lot.’”
(Sunan ibn Majah)