Musnad Ahmad 1012:1

Hushaym narrated to us, Mansur informed us, from al-Hasan, from Hattan ibn Abdullah al-Raqashi, from Ubadah ibn al-Samit, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Take from me, take from me. Allah has indeed provided a way for them: the unmarried [male] with the unmarried [female] is one hundred lashes and banishment for a year, and the married [male] with the married [female] is one hundred lashes and stoning."