Musnad Ahmad 1153:1983

Yazid narrated to us, he said: Muhammad ibn Ishaq informed us, from al-Zuhri, from Urwah, from Aisha, that the Messenger of Allah (peace and blessings of Allah be upon him) said to Abd ibn Zam'ah: "The child is for the bed, and for the adulterer is the stone." Then the Messenger of Allah (peace and blessings of Allah be upon him) ordered Sawdah bint Zam'ah to observe hijab from him because of what he saw of his resemblance to Utbah. So he did not see her until he met Allah.