Musnad Ahmad 30:2390

Isma'il narrated to us, from Yunus, from al-Hasan, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Is there any man who takes a word, or two, or three, or four, or five, from what Allah and His Messenger have ordained, and places them in the edge of his garment, then acts upon them and teaches them?" I said: "I [will]," and I spread out my garment. The Messenger of Allah (peace and blessings of Allah be upon him) continued speaking until he finished his speech. I then gathered my garment to my chest, and I hope that I have not forgotten a single hadith that I heard from him.