From Sahih Muslim (Hadith 3757):
Muhammad (one of the narrators) reported:I asked Anas b. Malik (Allah be pleased with him) knowing that he had a knowledge of (the case of li'an). He said: Hilal b. Umayya (Allah be pleased with him) accused his wife with the charge of fornication with Sharik b. Sahma, the brother of al-Bara'b Malik from the side of his mother. And he was the first person who invoked curse (li'an) in Islam. He in fact invoked curse upon her. Allah's Messenger (ﷺ) said: See to her if she gives birth to a white-complexioned child having dark hair and bright eyes; he must be the son of Hilal b. Umayya; and if she gives birth to a child with dark eyelids, curly hair and lean shanks, he must be the offspring of Sharik b. Sahma. He said: I was informed that she gave birth to a child having dark eyelids, curly hair and lean shanks
Reference: Muslim 3757