Musnad Ahmad 30:2443

Yahya ibn Sa'id al-Umawi narrated to us, he said: 'Ubayd Allah narrated to us, from Sa'id ibn Abi Sa'id, from his father, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "If the servant of one of you commits adultery..." and he mentioned the meaning of the hadith of Yahya ibn Sa'id al-Qattan, from 'Ubayd Allah.