Sahih Bukhari
Friday Prayer
Volume: 002 / Book Number: 013 / Hadith Number: 41
Narrated Jabir bin 'Abdullah:
The Prophet used to stand by a stem of a date-palm tree (while delivering a sermon). When the pulpit was placed for him we heard that stem crying like a pregnant she-camel till the Prophet got down from the pulpit and placed his hand over it.