What is the ruling on swearing by saying "I divorce my wife" concerning a matter the questioner knows to be untrue?

If you swore an oath of divorce falsely, you must repent of the lie. Divorce has occurred according to the majority of scholars, and you can take your wife back as long as she is within her waiting period (iddah). Ibn Taymiyyah holds the view that such an oath does not result in divorce, nor ẓihār, nor does it necessitate expiation. We advise you to refrain from swearing oaths of divorce.