Al-Mustadrak Ala al-Saheehain (5 Volume Set) المستدرك على الصّحيحَين (الحاكم النيسابوري)

Al-Dhahabî writes in his biographical encyclopedia entitled Siyar A`lâm al-Nubalâ’ “Biographies of Outstanding Personalities”: “The Mustadrak contains a lot of hadîth that conform to the conditions of authenticity of both (al-Bukhârî and Muslim) as well as a number of hadîth conforming to the conditions of either one of them. Perhaps the total number of such hadîth comprises a third of the book or less. A lot of the book is comprised of hadîth that appear on the surface to be on the conditions of one or both of them, but that have hidden within them subtle but substantial defects. A portion of the book contains chains of transmission that are good and acceptable. This is about a fourth of the book. The rest of the book is comprised of rejected and extremely strange hadîth. At the same time, there are about one hundred hadîth that the heart declares to be false...”