Sunan Abu Dawud
5208
Hasan Sahih+3

Narrated AbuHurayrah: The Prophet (ﷺ) said: When one of you comes to an assembly, he should give a salutation and if he feels inclined to get up, he should give a salutation, for the former is not more of a duty than the latter

Hasan SahihAl-Albani
Hasan SahihMuhammad Muhyi Al-Din Abdul Hamid