R. Nivas (1967), Transactions, Volume 4, The word langar, and this institution has been borrowed, so to speak, from the Sufis. The khanqas of the Chisti and other Sufi saints had a langar open to the poor and the rich, though the Hindus mostly kept away from them. To make the Brahmin sit with the pariah and do away with untouch- ability, and to make the Hindus and Muslims eat from the same kitchen and destroy all social, Indian Institute of Advanced Study, p. 190
Pemberton, Barbara (2023). "Polishing the Mirror of the Heart: Sufi Poetic Reflections as Interfaith Inspiration for Peace". In Shafiq, Muhammad; Donlin-Smith, Thomas (eds.). Mystical Traditions: Approaches to Peaceful Coexistence. Cham: Springer Nature Switzerland. pp. 263–276. doi:10.1007/978-3-031-27121-2_15. ISBN978-3-031-27121-2. Punjabi shaykh Farid al-Din Ganj-i-Shakar ( 1179–1266 ) opines
