Abu Jamrah relates: I performed Tamattu', and some people forbade me from it, so I asked Sayyiduna Ibn Abbas (may Allah be pleased with them both), and he told me to do it. Then I saw in a dream as though someone was saying: "An accepted Hajj, and an accepted Umrah." I told this to Sayyiduna Ibn Abbas (may Allah be pleased with them both), and he said: "Allahu Akbar! This is the Sunnah of Abu al-Qasim (peace and blessings be upon him)," or he said: "the Sunnah of the Prophet (peace and blessings be upon him)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12906