., E. 2023. Mandailing Scholar of the XX Century: Sufism Thought of Syeikh Syihabuddin Nasution Aek Libung (1892 -- 1967). KnE Social Sciences. 8, 4 (Mar. 2023), 549–558. DOI:https://doi.org/10.18502/kss.v8i4.12943.