In The Name of Allaah, The Most Merciful, The Bestower of Mercy
Ibn Abbaas narrated: Allaah’s Messenger [sallallaahu alayhi wasallam] placed his hand on my shoulder and said, “O Allaah! Grant him understanding in religion and teach him the interpretation of the Qur’aan.”
Musnad Ahmad 2397
Few Masaa’il Derived From This Hadeeth
 Ibn Abbaas’s [radiyallaahu anhu] knowledge in the subject matter of Tafseer of the Qur’aan.
 The different levels of the Mufassireen.
 Explanation of the Great Qur’aan by the Sahaabah.
Source: Arba’oona Hadeethaa Fee Uloomil Qur’aan. page 121 By Shaikh Muhammad Baazmool [hafidhahullaah Slightly paraphrased]