Hadith literature refers to the collection of sayings, actions, and approvals of the Prophet Muhammad. These texts serve as important sources of guidance for Muslims, complementing the Qur'an in matters of faith, law, and ethics. Hadiths are categorized based on their authenticity, with classifications such as Sahih (authentic) and Da'if (weak). The compilation of hadiths began in the 8th century, with scholars like Imam Bukhari and Imam Muslim playing key roles in gathering and verifying these narratives. Each hadith typically includes a chain of narrators, known as the isnad, which helps establish its credibility and reliability within the Islamic tradition.