“The Authority of Sunnah” by the eminent scholar Justice Mufti Muhammad Taqi Usmani is a meticulous, scholarly, and foundational work that comprehensively establishes and defends the unquestionable legislative authority of the Sunnah (Prophetic tradition) alongside the Qur’an. The book addresses modern doubts and intellectual challenges by presenting irrefutable scriptural and rational evidence proving that the Sunnah—including the Prophet’s صلی اللہ علیہ وسلم actions, sayings, and silent approvals—is a divinely inspired and necessary source for understanding and implementing the Sharī’ah. Mufti Usmani emphasizes the Sunnah’s role as the practical explanation and implementation of the Qur’an, making this an essential text for reinforcing the orthodox Islamic creed and methodology against revisionist thought.