Sahih Bukhari
Pilgrims Prevented from Completing the Pilgrimmage
Volume: 003 / Book Number: 028 / Hadith Number: 45
Narrated Abu Huraira:
Allah's Apostle 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)."