Explanation: Al-Mustadrak 'ala al-Sahihayn (Arabic: المستدرك على الصحيحين) or Mustadrak Al Hakim (Arabic: مستدرك الحاكم) is a five volume hadith collection written by Hakim al-Nishapuri (Nishapur is located in Iran). He wrote it in the year AH 393 (1002–1003 CE), when he was 72 years old.
Occurrence: Concept Academy Notes