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.
Sunan Abi Dawud Book 43, Hadith 436
← Previous Hadith The Companions of the prophet (ﷺ) said to the prophet (ﷺ): The people of the Book salute us. How should we reply to them? He said: say : the same to you.

Sunan Abi Dawud Book 43, Hadith 435 Next Hadith → I came to the Prophet (ﷺ) and said: Upon you be peace, Messenger of Allah! He said: Do not say: Upon you be peace, for "Upon you be peace" is the salutation to the dead.

Sunan Abi Dawud Book 43, Hadith 437