It was narrated from Jabir that whenever the Prophet (ﷺ) ascended the pulpit he would greet (the people with Salam).
Sunan Ibn Majah Book 5, Hadith 307
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Sunan Ibn Majah Book 5, Hadith 306 Next Hadith → “If you say to your companions: ‘Be quiet’ on a Friday while the Imam is delivering the sermon, you have engaged in Laghw (idle talk or behaviour).”

Sunan Ibn Majah Book 5, Hadith 308