Al-Matalib al-'Aliyah 4070 — The virtue of Ibn Abbas

It is narrated from the Successor Tawus (may Allah have mercy on him) that he said: I have kept the company of fifty or seventy elder Companions of the Messenger of Allah (peace and blessings be upon him), and there was not one of them who, on meeting Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) (in a discussion on a matter of knowledge), would oppose him; rather, they would say: "The matter is exactly as you have said," or they would say: "You have spoken the truth."
This hadith is sahih (authentic).