The Best Way for the Worshippers (Minhajal-Abidin)

This book may rightly be considered as a summary of Al Ghazali's Ihya Uloom Al-Deen (The Revival of the Religious Sciences ) which is widely regarded as one of the great works of Muslim spirituality; and has  for centuries been a  widely read and respected work in the Muslim world.
Imam Al Ghazali dictated this book to a very few and selected students in his very last days.