"I heard the Prophet reciting, when on the Minbar: And they will cry: "O Malik (keeper of Hell)!"." There are narrations on this topic from Abu Hurairah and Jabir bin Samurah.
Jami` at-Tirmidhi Book 4, Hadith 21
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Jami` at-Tirmidhi Book 4, Hadith 20 Next Hadith → "When Allah's Messenger descending the Minbar he would face our direction."

Jami` at-Tirmidhi Book 4, Hadith 22