Abu Wa'il · The Book of Jihad and Expeditions

Sahal b. Hunaif stood up on the Day of Siffin and said: O ye people, blame yourselves (for want of discretion) ; we were with the Messenger of Allah (ﷺ) on the Day of Hudaibiya. If we had thought it fit to fight, we could fight. This was in the truce between the Messenger of Allah (ﷺ) and the polytheists. Umar b. Khattab came, approached the Messenger of Allah (ﷺ) and said: Messenger of Allah, aren't we fighting for truth…