Musnad Abu Ya'la al-Mawsili 3:188

Ubayd Allah ibn Umar narrated to us, Abd al-Rahman narrated to us, Sufyan narrated to us, from al-A'mash, from Ibrahim al-Taymi, from his father, from Ali, who said: "We have nothing except the Book of Allah and this," meaning the scroll from the Prophet, may Allah bless him and grant him peace. And he mentioned the hadith.