Masrūq reports that ‘Abdullah bin Mas’ūd rađiyAllāhu ánhu once said,
If ‘Abdullah bin ‘Abbās rađiyAllāhu ánhu were our age, none of us would equal even a tenth of his knowledge.
Another narration adds that Abdullah bin Mas’ūd rađiyAllāhu ánhu said,
‘Abdullah bin ‘Abbās rađiyAllāhu ánhu is an exceptional commentator of the Qur’ân.
Mujâhid reports that Abdullah bin Abbas rađiyAllāhu ánhu would be referred to as an ‘ocean’ because of the great amount of knowledge he possessed.
Layth bin Abu Sufyan says that he once said to Taūs,
Why have you attached yourself to this youngster [Abdullah bin Abbas] as opposed to the senior companions rađiyAllāhu ánhum of the beloved Prophet śallAllāhu álayhi wa âlihi wa sahbihī wa sallam.
I have seen seventy Sahâba rađiyAllāhu ánhum who favoured the opinion of Abdullah bin Abbâs rađiyAllāhu ánhu when any difference of opinion arose.