Diversity is the nature of human nature, as well as the Indonesian nation, which has a pluralistic society. This pluralism is marked by the diversity of ethnicity, religion, language, and culture. These various variations give birth to life systems and legal norms, both written and unwritten as guidelines in regulating the behavior of the people in life which are contained in the form of traditions and laws. As a rule used to regulate the life of indigenous peoples, the existence of customary law occupies a very important position in realizing order and justice in society, in addition to existing national laws and regulations. The research method used in this research is qualitative-descriptive, and the results of this study explain that, in the perspective of the younger generation, larvul ngabal customary law is part of local wisdom that must be maintained as a cultural identity. Every member of the community from any group who comes and mingle with the Kei community is able to assimilate themselves and accept well the existence of larvul ngabal customary law. On the other hand, the arrival of Islamic religious teachings which are generally part of the identity of immigrants does not degrade the existence of larvul ngabal customary law. In several ways, customary law of larvul ngabal is relevant to Islamic teachings in the context of balance of life, justice and togetherness.