Musnad Abu Ya'la al-Mawsili 250:3

Abu Yasir ‘Ammar narrated to us, Hisham Abu al-Miqdam narrated to us, he said: My father narrated to me, from Yusuf ibn ‘Abd Allah ibn Salam, from his father, that the Prophet, may Allah bless him and grant him peace, said: "War is deception."