Tawus said: I sat in the company of seventy or eighty of the Companions of the Messenger of Allah (peace and blessings be upon him). Whoever among them differed with Sayyiduna Ibn Abbas (may Allah be pleased with them both) on any matter, when the two of them met, that Companion would say: The position is as you said; or he would say: You have spoken the truth.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10547