Rejang people customary law, severe penalties such as adultery are provided; which is in line with Islamic laws that makes it easier for the Rejang people and also one of the earliest people group to convert to Islam. In the present era, despite a number of them still adhere to traditional cultural practices, many Rejang people have received higher education and have been represented in various modern skilled professions or as government employees. There are a few festivals that are celebrated by the Rejang people especially, "Rayo" or "Idulfitri", "Rayo Ajai" or "Iduladha", annual celebration of each Regencies as well as Indonesian
Kayeli people there were approximately 800 people left by the early 21st century. In regards to religion, majority of the them are Sunni Muslims, with some remnants of pagan beliefs. Representative of the ethnic group have completely lost their native Kayeli language by the end of the 20th century as they began to adopt other indigenous Buru languages or Indonesian language. Ethnogenesis of Kayeli is directly associated with the colonization of the Buru island by the Dutch East India Company in the 17th century. In 1658, the first permanent Dutch settlement and a military fort were built at the southern coast of