It is narrated from Hazrat Ubadah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Even if it is a thread, return it, and avoid dishonesty in the spoils of war, for this will be a source of shame for the dishonest person on the Day of Resurrection.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22714
Hadith Gradingحکم دارالسلام:حديث حسن، وهذا إسناد حسن فى المتابعات والشواهد من أجل عبدالرحمن بن الحارث