"Jibrail send (greetings of) Salam to you." She said: "Wa 'alahisalam wa rahmatullah (and upon him be peace and mercy of Allah)."
Sunan Ibn Majah Book 33, Hadith 40
← Previous Hadith "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."

Sunan Ibn Majah Book 33, Hadith 39 Next Hadith → "When any of the People of the Book greets you with Salam (peace), then say, Wa 'alaikum(and also upon you)."

Sunan Ibn Majah Book 33, Hadith 41