What about Ibn Abbas on the distortion of the scriptures?
There’s a quotation from Ibn Abbas I’ve seen passed around in an attempt to say that he thought the Torah and the Injil were corrupted. However, the tafsir for 3:78 which speaks about by Ibn Kathir says the following:
Al-Bukhari reported that Ibn `Abbas said that the Ayah means they alter and add although none among Allah’s creation can remove the Words of Allah from His Books, they alter and distort their apparent meanings. Wahb bin Munabbih said, “The Tawrah and the Injil remain as Allah revealed them, and no letter in them was removed. However, the people misguide others by addition and false interpretation, relying on books that they wrote themselves.