The oldest Islamic educational institution is pesantren which is also a component of community education. The expansion and growth of Islam Nusantara and other Islamic institutions in Indonesia have been greatly assisted by pesantren. This study aims to find out the religious character of "ngaji laku" and the practice of pesantren. This research is a field research using a qualitative approach. Pesantren Sabilul Ma'arif is one of the pesantren that implements "ngaji laku" character education in its education system, this is done by various activities in the form of mandatory prayers in congregation, reciting the Qur'an, fasting suluk/mutih, yellow Islamic books (Kitab Kuning), various sunnah prayers: tahajjud, hajat, qabliyah subuh, kifaratul bauli, qabliyah ḍuhur, ba'diyah ḍuhur, qabliyah asar, ba'diyah maghrib, awwabin, rawatib, subutil iman, repentance, suluk, qabliyah isyak, ba'diyah isya', witir, ḍikr practices and tarbiyah (secret knowledge that no one should know) which not all boarding schools have. The religious element of "ngaji laku" is one that dominates education at Sabilul Ma'arif Islamic Boarding School.
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