Sahih Bukhari Volume 4, Book 61, Hadith 3587

حَدَّثَنَا إِسْمَاعِيلُ، قَالَ حَدَّثَنِي أَخِي، عَنْ سُلَيْمَانَ بْنِ بِلاَلٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، قَالَ أَخْبَرَنِي حَفْصُ بْنُ عُبَيْدِ اللَّهِ بْنِ أَنَسِ بْنِ مَالِكٍ، أَنَّهُ سَمِعَ جَابِرَ بْنَ عَبْدِ اللَّهِ ـ رضى الله عنهما ـ يَقُولُ كَانَ الْمَسْجِدُ مَسْقُوفًا عَلَى جُذُوعٍ مِنْ نَخْلٍ فَكَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا خَطَبَ يَقُومُ إِلَى جِذْعٍ مِنْهَا، فَلَمَّا صُنِعَ لَهُ الْمِنْبَرُ، وَكَانَ عَلَيْهِ فَسَمِعْنَا لِذَلِكَ الْجِذْعِ صَوْتًا كَصَوْتِ الْعِشَارِ، حَتَّى جَاءَ النَّبِيُّ صلى الله عليه وسلم فَوَضَعَ يَدَهُ عَلَيْهَا فَسَكَنَتْ‏

Narrated By Anas bin Malik : That he heard Jabir bin 'Abdullah saying, "The roof of the Mosque was built over trunks of date-palms working as pillars. When the Prophet delivered a sermon, he used to stand by one of those trunks till the pulpit was made for him, and he used it instead. Then we heard the trunk sending a sound like of a pregnant she-camel till the Prophet came to it, and put his hand over it, then it became quiet."