Sahih Al Bukhari – Book of Pilgrims Prevented From Completing The Pilgrimmage

Volumn 003, Book 028, Hadith Number 045.
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Narated By Abu Huraira RA : Allah's Apostle PBUH said, "Whoever performs Hajj to this House (Ka'ba) and does not approach his wife for sexual relations nor commits sins (while performing Hajj), he will come out as sinless as a newly-born child. (Just delivered by his mother)."