Musnad Ahmad 2154

Shu'bah said: I heard Abu Jamrah ad-Duba'i say: I did tamattu' and some people told me not to do that. I went to Ibn 'Abbas and asked him about that, and he told me to do it. He said: Then I went to the Ka'bah and slept, and someone came to me in my dream and said: (Your) "Unruh is accepted and so is your Hajj, I went to Ibn 'Abbas and told him about what l had seen, and he said: Allahu Akbar, Allahu Akbar Ile Sunnah of Abul-Qasim (ﷺ)' And he said concerning the hady (sacrificial animal) [that it may be] either a camel or a cow or a sheep or a share in a sacrifice.