Yahya bin Salah al-Wahadi يحيى بن صالح الوحاظي أبو زكريا · Etiquette

"Worship the Most Merciful and spread (the greeting of) peace.'"

"a man entered the masjid, and the Messenger of Allah(ﷺ) was sitting in a corner of the mosque. He prayed, then he came and greeted him with Salam(peace), and he said: 'Wa 'alaikassalm."