Musannaf Ibn Abi Shayba 9:445

Abu Dawud narrated to us, from Rabi'ah, from Salamah ibn Wahram, who said: I was sitting with Tawus. A man said to him: "I found a man in my seat." Tawus said: "If your soul is pleased to hold onto it, and you have seen what you have seen, then you know best."