Musnad Abu Ya'la al-Mawsili 164:4

Muhammad ibn Marzuq narrated to us, he said: Husayn al-Ashqar narrated to me, he said: Abdullah ibn Bukayr narrated to us, from Hakim ibn Jubayr, from Siwar Abu Idris, from al-Musayyib ibn Najabah, who said: I entered upon al-Hasan ibn Ali, and he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "War is deception."