Musnad Ahmad 723:3

'Abd al-Rahman narrated to us, from Sufyan, from Mansur, from Hilal ibn Yasaf, from Salamah ibn Qays, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said during the Farewell Pilgrimage: "They are only four: Do not associate anything with Allah, do not kill the soul that Allah has forbidden except by right, do not steal, and do not commit adultery."