Musannaf Ibn Abi Shayba 9:1186

Al-Fadl ibn Dukayn narrated to us, from Sufyan, from Abu Qays, from Hudhayl, from Abdullah, who said: The Messenger of Allah (may Allah bless him and grant him peace) cursed the one who marries a divorced woman to make her lawful for her former husband (al-muhallil) and the one for whom it is done (al-muhallal lahu).