Sunan al-Tirmidhi (also known as Jami' al-Tirmidhi) is one of the six canonical Hadith collections (Kutub al-Sittah) in Sunni Islam, compiled by Imam Abu 'Isa Muhammad ibn 'Isa al-Tirmidhi (209-279 AH/824-892 CE). A student of Imam al-Bukhari, al-Tirmidhi traveled extensively across Khurasan, Iraq, and the Hijaz collecting Hadith. His collection is unique among the six books for its analytical methodology,after narrating each Hadith, he provides his assessment of its authenticity level (sahih, hasan, da'if), explains the reasons for his classification, and often notes the differing opinions of jurists on the issue. This makes his work invaluable for understanding both Hadith criticism and fiqh (jurisprudence). Al-Tirmidhi was the first to systematically classify hasan (good) Hadith as a distinct category between sahih and da'if. His collection contains approximately 3,956 Hadith, organized thematically into chapters on legal topics, Quranic interpretation, prophetic virtues, and manners. He also includes biographical information about narrators and clarifies ambiguities in names. Imam al-Tirmidhi was known for his exceptional memory and precision; he reportedly lost his sight in later years, weeping for Allah. Sunan al-Tirmidhi is particularly valued by jurists for its focus on legally relevant traditions and by Hadith scholars for its critical apparatus. For Muslims, it provides a comprehensive resource for understanding prophetic teachings with scholarly evaluation integrated into the text itself.