Musnad Abu Ya'la al-Mawsili 154:21

Zuhayr narrated to us, Ibn 'Uyaynah narrated to us, from 'Amr, who heard Sa'id ibn Jubayr saying: I heard Ibn 'Umar saying: The Messenger of Allah (ﷺ) said to the two who are performing *li'an* (mutual cursing): "Your reckoning is with Allah. One of you is a liar. You have no way [to claim anything] against her." He said: "O Messenger of Allah, what about my wealth?" He said: "You have no wealth. If you were truthful against her, then it is because of what you made lawful of her private parts. And if you lied, then that is further away from you."