Sahih Muslim Book 17, Hadith Number 4198.
Chapter : He who confesses his guilt of adultery.
Jabir b. Samura reported: As he was being brought to Allah’s Apostle (may peace be upon him) I saw Ma’iz b. Malik a short-statured person with strong sinews, having no cloak around him. He bore witness against his own self four times that he had committed adultery, whereupon Allah’s Messenger (may peace be upon him) said: Perhaps (you kissed her or embraced her). He said: No. by God, one deviating (from the path of virtue) has committed adultery. He then got him stoned (to death), and then delivered the address: Behold, as we set out for Jihad in the cause of Allah, one of you lagged behind and shrieked like the bleating of a male goat, and gave a small quantity of milk. By Allah, in case I get hold of him, I shall certainly punish him.