Sahih Muslim Book 8, Hadith Number 3369.
Chapter: It is forbidden to divulge the secret of the woman.
Abu Sa’id al-Khudri (Allah he pleased with him) reported that Allah’s Messenger (May peace be upon him) said: The most wicked among the people in the eye of Allah on the Day of judgment is the men who goes to his wife and she comes to him, and then he divulges her secret.