The supplement to the two Sahihs, only 8 volumes (the introduced volumes - 1-2-3-6-7-8- indices) by an-Nisaburi

Al-Mustadrak on the Sahihayn by Al-Hafiz Abu Abdullah Al-Hakim Al-Naysaburi Number of volumes: 12 Volumes Carried out under the verification of a scientific team of more than sixty researchers in Islamic heritage and linguistics, supervised by a select group of scholars from the Kingdom of Saudi Arabia and the Arab Republic of Egypt, and issued in a scholarly verified bulletin on 16 ancient manuscripts of the book, including a volume that contains an extensive introduction to the most important issues and topics related to the book Al-Mustadrak, as well as comprehensive technical indexes and various scientific guides.