Musannaf Ibn Abi Shayba 9:888

'Abbad ibn al-'Awwam narrated to us, from Dawud, from Yazid ibn Abi Mansur—or ibn Mansur—from Silah ibn Ashyam, who said: "There is no harm if they are both repentant, for Allah is more worthy of their repentance. And if they are both fornicators, then the wicked are for the wicked."