Tafsir is one of the earliest academic activities of Muslims. According to the Quran, Muhammad was the first person who described the meanings of verses for early Muslims. Other early exegetes included a few Companions of Muhammad, like Ali ibn Abi Talib, Abdullah ibn Abbas, Abdullah ibn Umar and Ubayy ibn Kab. Exegesis in those days was confined to the explanation of literary aspects of the verse, the background of its revelation and, occasionally, interpretation of one verse with the help of the other. If the verse was about a historical event, then sometimes a few traditions (hadith) of Muhammad were narrated to make its meaning clear.
Who weren't 'Ali ibn Abi Talib and 'Abdullah ibn 'Abbas? (If the question is unanswerable, say "unanswerable")
unanswerable