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Imam Bukhari: founder of Hadith, the second authentic book of Islam after the Holy Qur'an.
It was in the second century Hijrah when most of the Sahaba who had learned Islam from the Holy Prophet directly were diminishing one after another. The last of Prophet's companions passed away in 110 A.H. Subsequently a possibility of misquoting the Prophet (peace be upon him) by some people with vested interest was quite apparent. So it was essential to collect and authenticate true Hadiths without sponsorship of any ruling authority, regional or national