Virtues and Merits of the Prophet (pbuh) and his Companions
Bukhari :: Book 4 :: Volume 56 :: Hadith 783
Narrated Ibn Umar:
The Prophet used to deliver his sermons while standing beside a trunk of a datepalm. When he had the pulpit made, he used it instead. The trunk started crying and the Prophet went to it, rubbing his hand over it (to stop its crying).
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