Narrated Abu Hazim: Sahl bin Sa`d was asked about the (Prophet's) pulpit as to what thing it was made of? Sahl replied: "None remains alive amongst the people, who knows about it better than I. It was made of tamarisk (wood) of the forest. So and so, the slave of so and so prepared it for Allah's Messenger (ﷺ) . When it was constructed and place (in the Mosque), Allah's Messenger (ﷺ) stood on it facing the Qibla and said 'Allahu Akbar', and the people stood behind him (and led the people in prayer). He recited and bowed and the people bowed behind him. Then he raised his head and stepped back, got down and prostrated on the ground and then he again ascended the pulpit, recited, bowed, raised his head and stepped back, got down and prostrate on the ground. So, this is what I know about the pulpit." Ahmad bin Hanbal said, "As the Prophet (ﷺ) was at a higher level than the people, there is no harm according to the above-mentioned Hadith if the Imam is at a higher level than his followers during the prayers."
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Narrated Sahl: The Prophet (ﷺ) sent for a woman from the emigrants and she had a slave who was a carpenter. The Prophet said to her "Order your slave to prepare the wood (pieces) for the pulpit." So, she ordered her slave who went and cut the wood from the tamarisk and prepared the pulpit, for the Prophet. When he finished the pulpit, the woman informed the Prophet (ﷺ) that it had been finished. The Prophet (ﷺ) asked her to send that pulpit to him, so they brought it. The Prophet (ﷺ) lifted it and placed it at the place in which you see now."