Fajr prayer
Idris began teaching at Darul Uloom Deoband in 1922. He was never assigned the elementary books; instead, the books initially assigned to him were "Hidayah awwalin" in Hanafi fiqh and "Maqamat-i Hariri" in Arabic literature. Later Idris was assigned to teach the hadith collection "Mishkat al-Masabih". "Tafsir al-Jalalayn" was also his responsibility. Idris remained with the Darul Uloom for nine years. During this time he regularly delivered a lecture on the Qur'an after Fajr prayer in the madrasah's Naudarah building. Attended by both intermediate and advanced students, in these lessons difficult issues in tafsir, hadith, ilm al-kalam, and fiqh were discussed.