The Messenger of Allah (Sallallahu Alaihi Wasallam) 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)."
[Sahih-Al-Bukhari Book #28, Hadith #45].
