Taking an oath and Qasamah are two reasons to prove criminal claims. In this paper, an attempt is made to address this important question that is it possible to use taking an oath and Qasamah in proving blood money for body parts and interest? Legal texts and jurisprudential and legal foundations show that although apparently taking an oath can be used in proving financial matters like blood money, but this proof seems to emphasize only testimony; thus, providing testimony beside an oath is actually only one testimony and cannot be considered as oath. The present paper aims to validate taking an oath and Qasamah in proving blood money for body parts and interests. The method used in conducting the study is descriptive-analytical. Library data collection and comparative approach was done to investigate its jurisprudential validity. The findings indicate that, in the event of dispute between victim and criminal regarding loss of interests, it is provable with Qasamah. According to well-known comment by jurists and legal procedure, Qasamah in injury accrues blood money, not Qisas. But, with support of some jurists' comment, we can suggest that in case the crime results in amputation, one may suggest Qisas due to performing Qasamah.