ibn Umar · The Book of Invoking Curses

Your account is with Allah. One of you must be a liar. You have now no right over this woman. He said: Messenger of Allah, what about my wealth (dower that I paid her at the time of marriage)? He said: You have no claim to wealth. If you tell the truth, it (dower) is the recompense for your having had the right to intercourse with her, and if you tell a lie against her, it is still more remote…

Allah knows that one of you is a liar. Is there one to repent among you?

Allah's Messenger (ﷺ) asked a person from the Anger and his wife to invoke curse (upon one another in order to testify to their truthfulness), and then effected separation between them.