The Messenger of Allah, peace and blessings be upon him, said:
The closest of the people to me on the Day of Resurrection are those who invoked the most blessings upon me.
Source: Sunan At-Tirmidhi 484, Grade: Hasan
Whenever we invoke peace and blessings upon the Prophet, Allah will send peace and blessings upon us ten times, thereby filling our records with good deeds.
Abu Huraira (may Allah be pleased with him) reported: The Messenger of Allah, peace and blessings be upon him, said:
Whoever sends blessings upon me once will have Allah send blessings upon him ten times.