Banī Asad tribe won a good reputation among Muslims, especially Shi’a, because some of them buried the martyrs of Karbala after Ashura. Some groups of this tribe came to Iran during the Islamic conquests and settled in some provinces, particularly in parts of eastern Fars, western Kerman, and Birjand. Sirjan and some of its surrounding villages is the main residence of this tribe. Some documents are obtained from Banī Asad tribe in Sirjan, relating to Safavid period, especially Shah Abbas era. According to these documents, Banī Asad were exempt from taxing, by that reason that their great grandparents buried the martyrs of Karbala. They were exempt from paying court taxes or and wealth (Mālojahāt) such as charges, dues, taxes and exempt of duty and servitude. The governors were obligated to perform command of Safavid Shah about this tribe. These documents express some of Safavid social and cultural traditions regarding a respected group, and governmental point of view toward Shi'i symbols in Iran. Nowadays in Sirjan based on the same document, Bani Asad introduce themselves as descendents of their ancestors in the day after 'Ashura. They move convoys and play Ta'ziay (passion play) of burial of Karbala martyrs. The present research consists of two parts. Firstly, the historical evolutions of this tribe will be studied, and secondly, the documents will be examined and studies with explorative method in order to construe the documents.