Abu Sa'id al-Khudri (RA) reported that Allah's Messenger (ﷺ) said: The most wicked among the people in the eye of Allah on the Day of Judgment is the man who goes to his wife and she comes to him, and then he divulges her secret.
Abu Sa'id al-Khudri (RA) reported Allah's Messenger (ﷺ) as saying: The most important of the trusts in the sight of Allah on the Day of Judgment is that a man goes to his wife and she goes to him (and the breach of this trust is) that he should divulge her secret. Ibn Numair narrates this hadith with a slight change of wording.
Abu Saeed Al-khudri reported the Messenger of Allah ﷺ as saying: The most serious breach of trust in Allah’s sight is that a man who has intercourse with his wife, and she with him, spreads her secret.
Shaykh Umar Farooq Saeedi
Benefits and Issues: Allah, the Mighty and Majestic, has made husband and wife as garments for one another, so to disclose each other's secrets before others is a very reprehensible act. Except in the case where, due to some Shar‘i necessity, one is required to mention something before a judge (qadi) or the like.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 4870