Musannaf Ibn Abi Shayba 19:618

Abu Bakr narrated to us, he said: Dawud ibn Abd Allah narrated to us, he said: Abd al-Aziz ibn Muhammad narrated to us, from Salih ibn Muhammad ibn Za'idah, from Salim ibn Abd Allah, from his father, from Umar ibn al-Khattab, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever you find has committed ghulul (theft from the spoils of war), then burn his belongings."