Al Salamu 'Alaykum.
The basis of Dar al-‘Uloom (Deoband) was Inaabat Il-Allah (turning towards Allah). Mawlana Yasin Sahib said, “We saw that time of the seminary when the highest to the lowest teacher (ustaad) and even the door-keeper and the orderlies were Saahib-e-nisbat and `awliya’. At that time the school was a place of knowledge during the day and a Khanqah at night. During the last portion of the night, the sounds of Qur’anic recitation (tilaawat) and remembrance of Allah (dhikr) could be heard from most rooms. This in reality is the special distinction of Dar al-‘Uloom.”
From ‘Ulama-e-Deoband Kya The?