This book is an English translation of the book (الاتباع و أصول فقه السلف) ‘Al Ittiba and the Principles of ‘Fiqh’ of the Righteous Predecessors’ by the great noble scholar, muhaddith, faqeeh, professor sheikh Wasiullah ibn Muhammad Abaas, may Allah preserve him and raise his status in this world and the next. I depended upon the first (2010/1431H) ‘Dar ul Istiqaamah’ printing of this book while translating.