Muslim Ibn al-Hajjaj, commonly known as Imam Muslim, was a prominent Islamic scholar born in 821 CE in Nishapur, Persia. He is best known for compiling one of the most authentic collections of Hadith, which are the sayings and actions of the Prophet Muhammad. His work, titled Sahih Muslim, is considered one of the two most reliable collections of Hadith in Sunni Islam, alongside Sahih al-Bukhari. Ibn al-Hajjaj dedicated his life to the study and verification of Hadith, traveling extensively to gather authentic narrations. His rigorous methodology in evaluating the credibility of narrators set a standard for future scholars. He passed away in 875 CE, leaving a lasting legacy in the field of Islamic scholarship.