Musnad Ahmad

It is narrated from Hazrat Ubadah (may Allah be pleased with him) that once the Holy Prophet (peace and blessings be upon him) led the people in prayer during a battle, placing a camel from the spoils of war as a sutrah in front of him. When he finished the prayer by saying salam, he stood up, took the camel’s hump between his two fingers, and said: "This is your spoils of war, and apart from the khums, my share in it is equal to yours, and the khums is also returned to you. Therefore, if anyone has even a needle or thread, let him bring it back, or if it is something bigger or smaller, let him also return it. Do not commit treachery with the spoils of war, for treachery will be a cause of fire and shame for the traitor in this world and the Hereafter. And strive in Allah’s path against people, whether they are near or far, and do not care about the blame of any blamer regarding Allah. Establish the limits of Allah in travel and at home, and strive in the way of Allah, for striving in Allah’s path is one of the doors of Paradise, through which Allah grants relief from grief and distress."