Musannaf Ibn Abi Shaybah 36194 — Book of History

Abu Raja said: I asked al-Hasan al-Basri (may Allah have mercy on him): "When were you last in touch with Madinah?" He said: "My connection with Madinah has been cut off since the Battle of Siffin." The narrator said: I asked: "When did you reach puberty?" He (may Allah have mercy on him) said: "One year after the Battle of Siffin."