Sa'id bin Abyad bin Hammal narrates that his father, Sayyiduna Abyad bin Hammal (may Allah be pleased with him), when he came as a delegate to the Messenger of Allah (peace and blessings be upon him) in Madinah, spoke to him (peace and blessings be upon him) about the sadaqah (charity due), and he (peace and blessings be upon him) said: "O brother of Saba'! Sadaqah must be given." He said: "O Messenger of Allah! We have only sown cotton. The people of Saba' have scattered, and only a few of them remain in Ma'rib." So the Prophet (peace and blessings be upon him) made a settlement with Sayyiduna Abyad bin Hammal (may Allah be pleased with him) that, on behalf of the people of Saba' who remained in Ma'rib, seventy garments of the best value of Ma'afiri cloth would be paid every year. And they continued to pay it until the Messenger of Allah (peace and blessings be upon him) passed away.
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 802