Riyad-us-Saliheen 1583
Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah (PBUH) said, "He who deceives another's wife or his slave is none of us."
[Abu Dawud]
To incite or provoke someone's wife or slave against her husband or his master or to create hatred between the two is a great crime, because a Muslim is required to create peace and accord amongst people. It is against his conduct to foment dissension and discord between them.