Aslam o alaika yarsoolallah

in Qur’an Allah says:

Surely, Allah and (all) His angels send blessings and greetings on the Holy Prophet (blessings and peace be upon him). O, believers! Invoke blessings on him and salute him with a worthy salutation of peace abundantly (and fervently).[al-Ahzāb, 33:56]