Musnad Abu Ya'la al-Mawsili 118:19

Muhammad ibn 'Abbad al-Makki narrated to us, Sufyan narrated to us, he said: I memorized from al-Zuhri, from the beginning to the end, that he heard Anas saying: The Messenger of Allah (ﷺ) arrived in Medina while I was ten years old, and he passed away while I was twenty years old. My mothers used to urge me to serve him.