Musnad Ahmad 30:124

Al-Walid narrated to us, Al-Awza'i narrated to us, Yahya narrated to us, from Abu Salamah, from Abu Hurairah. And Abu Dawud said: Harb narrated to us, from Yahya ibn Abi Kathir, he said: Abu Salamah narrated to me, Abu Hurairah narrated to us—the meaning—he said: When Allah granted the conquest of Makkah to His Messenger (ﷺ), the Messenger of Allah (ﷺ) stood among them, praised Allah and extolled Him, then said: "Indeed, Allah restrained the elephant from Makkah and gave His Messenger and the believers authority over it. It was only made lawful for me for an hour of the day, and it is forbidden from this day until the Day of Resurrection. Its trees shall not be cut, its game shall not be startled, and its lost property is not lawful except for one who announces it. Whoever has a person killed, he has the choice of two options: either he accepts blood money (diya), or he executes (the killer)." A man from the people of Yemen, called Abu Shah, stood up and said: "O Messenger of Allah, write it down for me." The Messenger of Allah (ﷺ) said: "Write it for Abu Shah." Then Abbas stood up—or he said: Abbas said: "O Messenger of Allah, except for the *idhkhir* (lemon grass), for it is for our graves and our houses." The Messenger of Allah (ﷺ) said: "Except for the *idhkhir*." I said to Al-Awza'i: "What is his saying: 'Write it for Abu Shah'? And what were they writing for him?" He said: "He means: 'Write for him the sermon he heard.'" Abu Abd al-Rahman said: "There is nothing narrated regarding the writing of Hadith more authentic than this Hadith, because the Prophet (ﷺ) commanded them, saying: 'Write for Abu Shah' what the Prophet (ﷺ) heard, his sermon."