Qaa'idah 'Adhimah is a book that explains the difference in worship of Allaah between the People of Islaam and The People of Shirk. Written by ash-Shaykh al-Islaam Ibn Taymiyyah in one volumes containing 189 pages. Printed by Dar al-'Aasimah (KSA) on yellow paper. Checked by Sulayman bin Saalih al-Ghasn.