Musannaf Ibn Abi Shaybah 18989 — A man with several wives who says

Abu Ja'far (may Allah have mercy on him) was asked: A man had four wives. One of them looked in on him, and he said, "You are divorced irrevocably." When he came to them, each of them began saying that it was the other one, and he could not recognise which one she was. What is the ruling? Abu Ja'far (may Allah have mercy on him) said: All of them are separated from him.