Muhammad bin Sirin narrates from Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) that he swore an oath about some good deed and gave the expiation for his oath. He ordered that the poor be brought into the Bayt al-Mal (treasury), and ordered a bowl of tharid to be brought, which was placed before them, and they ate from it. Then he clothed each person, giving either an upper garment or a waist-wrapper.
The Shaykh (may Allah have mercy on him) said: He did not consider the tharid sufficient for the expiation, so he also clothed each one of them.
Zahdam al-Jarmi narrates from Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) that in expiation for his oath he gave ten poor persons garments, to each poor person one garment of the mu'aqqad cloth of Hajar.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأيمان / 19981