Musannaf Ibn Abi Shayba 33:566

Affan narrated to us, he said: Ja'far ibn Sulayman narrated to us, he said: Muhammad ibn al-Munkadir narrated to us, from Jabir ibn Abd Allah al-Ansari, who said: A man saw a skull, and he spoke to himself about something. He said: So he fell down prostrating, repentant in his place. He said: Then it was said to him, "Raise your head, for you are you, and I am I."