“Where is sola scriptura taught in the Bible?” most Protestants will immediately respond as I did, by simply citing II Tm. 3:16:
All scripture is inspired by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.
“How can it get any plainer than that? Doesn’t that say the Bible is all we need?” Question answered.