Sa'id bin Abi al-Hasan narrates that Sayyiduna Abu Bakrah (may Allah be pleased with him) came regarding some testimony, and a man stood up from his place, but he refused to sit there and said: The Prophet (peace and blessings be upon him) "forbade this, and also that a man should wipe his hand on the garment of someone who has not clothed him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5900