Kutub refers to a collection of sacred texts in Islam, particularly the Hadith, which are the sayings and actions of the Prophet Muhammad. The term is often used to denote the most authentic and widely accepted collections of these teachings, which guide Muslims in their faith and daily practices. The most recognized kutub include Sahih al-Bukhari and Sahih Muslim, which are considered the most reliable sources of Hadith. These texts play a crucial role in understanding Islamic law, ethics, and the life of the Prophet, serving as a foundation for the beliefs and practices of Muslims around the world.