Sahih Bukhari Volume 2, Book 26, Hadith Number 747.

Narated By Abu Jamra : I asked Ibn Abbas about Hajj-at-Tamattu’. He ordered me to perform it. I asked him about the Hadi (sacrifice). He said, “You have to slaughter a camel, a cow or a sheep, or you may share the Hadi with the others.” It seemed that some people disliked it (Hajj-at-Tamattu). I slept and dreamt as if a person was announcing: “Hajj Mabrur and accepted Mut’ah (Hajj-At-Tamattu’)” I went to Ibn Abbas and narrated it to him. He said, “Allah is Greater. (That was) the tradition of Abu Al-Qasim (i.e. Prophet). Narrated Shu’ba that the call in the dream was. “An accepted ‘Umra and Hajj-Mabrur.”