Abu Salam (may Allah have mercy on him) informed Umar bin Abdul Aziz (may Allah have mercy on him): We went with Abdur Rahman bin Khalid (may Allah be pleased with him) towards the Romans. When we reached Darb, he announced: "Do not take even a thread or a needle from the enemy's land; this would be betrayal."
Hadith Referenceسنن سعید بن منصور / كتاب الجهاد / 3901