Musnad Ahmad 980:7

Yahya narrated to us, from Sufyan, Mansur narrated to us, from Rib'i, from Abu Mas'ud, from the Prophet, peace and blessings of Allah be upon him, who said: "Indeed, among what the people have attained from the speech of the first prophecy is: If you do not feel shame, then do what you wish." Ibn Malik said: Al-Fadl ibn al-Hubab narrated to us, Al-Qa'nabi narrated to us, Shu'bah narrated to us, Mansur narrated to us, from Rib'i, from Abu Mas'ud, from the Prophet, peace and blessings of Allah be upon him, who said: "Indeed, among what the people have attained from the speech of the first prophecy is: If you do not feel shame, then do what you wish."