Bhai Sati Das, Bhai Mati Das and Bhai Dyal Das were all executed at kotwali (police-station) in the Chandni Chowk area of Delhi, under the express orders of emperor Aurangzeb just prior to the martyrdom of Guru Tegh Bahadur. Bhai Sati Das was executed by the means of being wrapped in cotton wool soaked in oil and set on fire.During the time after Guru Har Krishan's death at Delhi and the uncertainty of the next Guru, the Bhai Mati Das and Bhai Sati Das sometimes find mention in being present looking for the Guru or directly after when Baba Makhan Shah Labana found Guru Tegh Bahadur at the village of Bakala where the new Guru was then residing. The Guru entrusted financial activity to Bhai Mati Das thus he is sometimes given the name Diwan Mati Das whereas, according to Bhatt Vahi Talauda, Bhai Sati Das served Guru Tegh Bahadur as a cook for the Guru. The two brothers accompanied Guru Teg Bahadur during his 2-year stay at Assam. Guru Tegh Bahadur bought a hillock near the village of Makhowal five miles north of Kiratpur and established a new town, Chakk Nanaki now named as Anandpur Sahib (the abode of bliss) where Mati Das and Sati Das were also present. Bhai Sati Das was known to have a great understanding of the Persian language and according to some sources taught the language to the young Gobind Rai (Guru Gobind Singh).