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The two Sahih collections (Sahihayn), namely Sahih al-Bukhari and Sahih Muslim, are considered the most authentic books after the Quran in Sunni Islam. They contain extensive collections of narrations attributed to the Prophet Muhammad, known as Hadith. These collections hold great significance as they help provide guidance, supplement the teachings of the Quran, and play a crucial role in shaping Islamic law and jurisprudence.