Musannaf Ibn Abi Shayba 23:163

Bakr ibn Abd al-Rahman narrated to us, he said: Isa informed us, from Muhammad ibn Abi Layla, from Atiyyah al-Awfi, from Abu Sa’id, from the Prophet, peace and blessings of Allah be upon him, who said: "Whoever sees me in a dream has indeed seen me, for the devil does not impersonate me."