It is narrated from Sayyiduna Rabi'ah al-Jurashi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever conceals theft from the spoils of war is like him (the one who stole)."
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4583