This lesson examines the historical process of Tadwīn al-Sunnah (تدوين السُّنَّة), meaning the systematic compilation and preservation of the Sunnah of the Messenger of Allāh ﷺ. The objective is not merely to recount historical events, but to clarify widespread misunderstandings surrounding how the Sunnah was preserved, transmitted, and eventually codified into major ḥadīth works. A correct understanding of Tadwīn al-Sunnah removes doubts about the reliability of the Sunnah and demonstrates the depth, rigor, and intentionality of the early Muslim scholarly tradition. A key premise of the lesson is that the preservation of the Sunnah differs fundamentally from the preservation of the Qurʾān. While the Qurʾān was preserved through tawātur and mass memorization under divine guarantee, the Sunnah was preserved through a multi-layered system of memorization, practice, teaching, scrutiny, and later documentation. This difference does not imply weakness, but rather reflects the distinct nature of each source of revelation.