ENOfficial
Jabir reported God's Messenger as saying, “War is deception.” (Bukhari and Muslim.)
Source: sunnah.com
Other translations
Arabic
وَعَنْ جَابِرٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «الْحَرْب خدعة»
sunnah.com
Mishkat al-Masabih
Book 19Hadith Number 3939