Sahih Bukhari Volume 003, Book 038, Hadith Number 508.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 38. Representation, Authorization, Business by Proxy.
Narated By Zaid bin Khalid and Abu Huraira : The Prophet said, "O Unais! Go to the wife of this (man) and if she confesses (that she has committed illegal sexual intercourse), then stone her to death."