Jabir reported the Messenger of Allah ﷺ as saying “War is deception. ”

Narrated Kab ibn Malik: When the Prophet ﷺ intended to go on an expedition, he always pretended to be going somewhere else, and he would say: War is deception. Abu Dawud said: Only Mamar has transmitted this tradition. By this he refers to his statement "War is deception" through this chain of narrators. He narrated it from the tradition of Amr bin Dinar from Jabir, and from the tradition of Mamar from Hammam bin Munabbih on the authority of Abu Hurairah.

Humaid bin Abdur-Rahman quoted his mother as saying: The Prophet ﷺ said: He who forged in order to put things right between two persons did not lie. The version by Ahmad ibn Muhammad and Musaddad has: The liar is not the one who puts things right between people, saying what is good and increasing good.

Umm Kulthum, daughter of Uqbah, said: I did not hear the Messenger of Allah ﷺ giving licence for anything people say falsely except in three matters. The Messenger of Allah ﷺ would say: I do not count liar a man who puts things right between people, saying a word by which he intends only putting things right, and a man who says something in war, and a man who says something to his wife says something to his husband.