The article deals with the issue of the Islamic endowment, and that from two angles: the first is the jurisprudential angle, and the second is the contemporary investment angle in defining the terminological consideration of the issues of the Islamic endowment. The interest in investing endowments and preserving their continuity now the same. This allows for a fundamental issue, namely, the preparation of investment programs that take into account the interests and legitimacy aspects. In addition to maintaining the delicate balance between its openness to the requirements of preponderant interests and preserving the endowment that is embodied in the survival of the eye or what takes its place.