حَدَّثَنَا عَلِيُّ بْنُ سَهْلٍ الرَّمْلِيُّ، قَالَ حَدَّثَنَا الْوَلِيدُ، قَالَ قُلْتُ لأَبِي عَمْرٍو مَا يَكْتُبُوهُ قَالَ الْخُطْبَةَ الَّتِي سَمِعَهَا يَوْمَئِذٍ مِنْهُ ‏.‏

Al-Walid said : I asked Abu `Amr: What are they writing? He said: The sermon which he heard that day. Translation Not Available

Book reference: Sunan Abi Dawud Book 26 Hadith 3650
Web reference: Sunan Abi Dawud Book 25 Hadith 3642