Quran 66:3 — Prohibition (Al-Tahreem)

The prophet had trusted some of his wives with a certain statement, then one of them spread it, and GOD let him know about it. He then informed his wife of part of the issue, and disregarded part. She asked him, "Who informed you of this?" He said, "I was informed by the Omniscient, Most Cognizant."

[66:2] GOD has decreed for you the laws dealing with your oaths. GOD is your Lord, and He is the Omniscient, Most Wise.

[66:4] If the two of you repent to GOD, then your hearts have listened. But if you band together against him, then GOD is his ally, and so is Gabriel and the righteous believers. Also, the angels are his helpers.