It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) passed by Sayyiduna Abu Qatadah (may Allah be pleased with him), who was standing by a man whom he had killed. The Prophet (peace and blessings be upon him) said: "Leave the belongings of the slain man with him." (Because at that time, the principle was that in the battlefield, whoever killed someone would receive his belongings.)