Hadith 26:10
Sahih Maqtu' (Al-Albani)
Al-Walid said :
I asked Abu `Amr: What are they writing? He said: The sermon which he heard that day.
حَدَّثَنَا عَلِيُّ بْنُ سَهْلٍ الرَّمْلِيُّ، قَالَ حَدَّثَنَا الْوَلِيدُ، قَالَ قُلْتُ لأَبِي عَمْرٍو مَا يَكْتُبُوهُ قَالَ الْخُطْبَةَ الَّتِي سَمِعَهَا يَوْمَئِذٍ مِنْهُ
Original Reference: Sunan Abi Dawud 3650