Hadith: Whoever believes in Allah and the Last Day should not ride a mount belonging to the spoils of Muslims and then returns it when it becomes skinny out of exhaustion. Whoever believes in Allah and the Last Day should not wear a garment belonging to the spoils of the Muslims and then returns it when it is worn out

عن رويفع بن ثابت الأنصاري أن النبي صلى الله عليه وسلم قال: «من كان يؤمن بالله وباليوم الآخر فلا يَركَب دابة مِن فَيءِ المسلمين حتى إذا أَعْجَفَها رَدَّها فيه، ومن كان يؤمن بالله وباليوم الآخر فلا يَلبس ثوبا مِن فَيءِ المسلمين حتى إذا أَخْلَقَه رَدَّه فيه».
[حسن] - [رواه أبو داود وأحمد والدارمي]

Ruwayfi‘ ibn Thābit (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Whoever believes in Allah and the Last Day should not ride a mount belonging to the spoils of Muslims and then returns it when it becomes skinny out of exhaustion. Whoever believes in Allah and the Last Day should not wear a garment belonging to the spoils of the Muslims and then returns it when it is worn out."
Hasan/Sound. - [Abu Dawood]

Explanation

This Hadīth states that it is impermissible for any of the Muslim Mujāhids to wear a garment from the spoils of war until that garment is worn out and then returns it. Likewise, it is impermissible for a Muslim Mujāhid to ride a mount belonging to the spoils of war until he emaciates it and then returns it to the spoils. This behavior is forbidden because it harms the other fighters entitled to a share in the spoils. Nevertheless, it is not sinful to ride a mount without emaciating it, or wear a garment without damaging it. For example, one may use a mount to return home or to distance himself from the enemy and then return it, or to wear a garment to conceal his ‘Awrah or to keep himself warm and then return it. Rather, in such a case, he must return them to the spoils of war after using them for those purposes in order to be absolved of liability in this world and in the Hereafter.