The Persatuan Islam (Persis, Islamic Union), an Indonesian Islamic educational organisation founded in 1923, concentrated on elucidating Sunnī teachings, Islamic logic, and the use of a simple Indonesian vocabulary. Originating as a study group in Bandung, it evolved into a centre of Islamic propagation (tablīgh) and later founded a private Islamic school system in West Java. In the 1930s one group of its scholars left for Bangil, in East Java, where a boarding school (pesantren) and university were established. The Bandung centre always regarded the Sundanese populat…