Musnad Ahmad 32:510

Wahb ibn Jarir narrated to us, Hisham ibn Hassan narrated to us, from Muhammad—meaning Ibn Sirin—from Anas ibn Malik, that Hilal ibn Umayyah accused his wife of adultery with Sharik ibn Sahma. The Messenger of Allah (peace and blessings of Allah be upon him) said: "Observe her; if she gives birth to a child who is curly-haired, kohl-eyed, and thin-legged, then he belongs to Sharik ibn Sahma. And if she gives birth to a child who is fair-skinned, straight-haired, and has eyes like those of a Qadi (a specific description of eye shape), then he belongs to Hilal ibn Umayyah." She then gave birth to a child who was curly-haired, kohl-eyed, and thin-legged.