Musannaf Ibn Abi Shayba 35:34

'Abdah narrated to us, from al-A'mash, from Ibrahim, from 'Alqamah, from 'Abdullah, that the Prophet (ﷺ) performed *li'an* (imprecation) between a man and a woman. He said: "It is likely that she will bring him forth black and curly-haired." So she brought him forth black and curly-haired.