If you haven't heard of Ibn-Daqiq Al-Eid you probably don't know much about hadith. In fact, you probably don't know much about Islamic history period. That's how famous and revered Ibn-Daqiq was and still is. On the day of his funeral in the fourteenth century, the city of Cairo came to a halt and the Egyptian army stood in honor. That's because the world didn't just lose a scholar but lost the scholar of scholars and, literally, the judge of judges. In his lifetime, Ibn-Daqiq wrote many books but this has become his most popular. In it he comments on the forty hadiths compiled by Yahya Al-Nawawi and known as the Nawawi Forty Hadiths. His commentary has become so popular that it is virtually impossible for any scholar to write a serious book about the forty hadiths without quoting Ibn-Daqiq. This is the only book that combines the sagacity of Ibn-Daqiq and the vast knowledge of Al-Nawawi. The book was written centuries ago but its benefits are everlasting. The book is indispensible for anyone who wants to study Islam thoroughly and laconically from the masters themselves. We translated from Arabic Ibn-Daqiq's commentary in its entirety. We listed the text of each hadith in Arabic first and followed it by the English translation of the hadith and commentary. We added a detailed table of contents, explanatory notes, and a thorough index. A short introduction to the science of hadith by the translators is also included. To show you the importance of the hadiths in this book, we need to go no further than to state Imam Al-Nawawi's own words: "It is incumbent on anyone who looks forward to the hereafter to know these hadiths due to the important information that they contain and the attention that they bring to all the pious deeds."