In the last century, a movement has appeared calling for the abandonment of the traditional Islamic Madhhabs. This misleading call falsely presented as ‘following the Qur’an and Sunnah’ has caused confusion amongst the Muslim masses. The people of knowledge have termed this movement’s call and its supporters ‘la madhhabiyya’. One of the sources for the spread of this innovation was a book written by Muhammad Sultan al-Ma‘sumi al-Khajnadi al-Makki which was translated and distributed in English as ‘Should a Muslim Follow a Particular Madhhab?’ and ‘The Blind Following of Madhhabs’. It was in response to this book, taught and revered by prominent ‘la madhhabi’ scholars, that Shaykh Dr. Muhammad Sa‘id Ramaḍan al-Buti first wrote his groundbreaking work. Later editions of this book, the translation of which we have before us, included the aftermath of various debates Shaykh al-Buti was subsequently challenged to by his opponents and also incorporated counter-replies to the likes of the late Shaykh Muhammad Nasiruddin al-Albani, Muhammad ‘`Id al-`Abbasi, Mahmud Mahdi al-Istanbuli and Khayruddin Wanli. This book is a decisive refutation of those who call to the misguidance of ‘Abandoning the Madhhabs’ for it is, indeed, The Most Dangerous Bid`ah Threatening the Islamic Shari`ah.