Hadith 2033
It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "No person can commit a major theft of something valuable, towards which people's eyes are set, while remaining a believer; and if he is committing theft, then in that state he does not remain a believer."
Hadith 2034
Abdur Rahman bin Samurah said: The Messenger of Allah (peace be upon him) forbade looting. Imam Darimi (may Allah have mercy on him) said: What is meant by this is the looting of war booty before its distribution in battles.