This traditional marriage is a reflection of local wisdom that continues to survive in the current of modernization and globalization. One of the important elements in this traditional marriage is the nyabung tradition, a procession that has symbolic and social meaning in it. This tradition not only strengthens the bond between the bride and groom, but also strengthens extended family and community relationships. This research is a qualitative research that uses library study and field study methods, with a case study approach using observational data collection techniques, direct observation in the Maron area and interviews with elders in the Maron village. Research shows that the tradition of merging according to Islam does not contain any prohibitions included in its implementation. Because this nyabung tradition can be classified as "urf' fi'li", which means that it is a tradition related to actions carried out. By considering the benefits and negative effects, this tradition is also considered urf shahih, because the nyabung tradition is something that is known or familiar to humans and does not conflict with sharia'. Therefore, the tradition of merging in happiness is still valued as part of cultural heritage in customary law. On the other h and, the acceptance of this tradition in Islamic law depends on whether or not there are elements that conflict with sharia. Thus, there has been harmony between customary law and Islamic law in the nyabung tradition, because in its implementation there are no conflicting elements.