Waki' bin al-Jarrah وكيع بن الجراح · The Book on Jihad

That the Messenger of Allah (ﷺ) said: "War is deceit." There are narrations on this topic from 'Ali, Zaid bin Thabit, 'Aishah, Ibn 'Abbas, Abu Hurairah, Asma' bint Yazid bin As-Sakan, Ka'b bin Malik and Anas bin Malik. This Hadith is Hasan Sahih.

"The Messenger of Allah sent us on a military expedition, and the people turned to escape. So we arrived in Al-Madinah and concealed ourselves in it and we said: 'We are ruined.' Then we went to the Messenger of Allah (ﷺ) and we said: 'O Messenger of Allah! We are those who fled.' He said: 'Rather you are Al-'Akkarun (those who are regrouping) and I am your reinforcement. This Hadith is Hasan Gharib. We do not know of it except…