One of the phrases that I hear the most when having religious discussions with Protestants is “Well, where is that in the Bible?” I think that they should ask themselves, (and Catholics should ask them this too) “Where does the Bible say that everything Christian must be found in the Bible?”
After all, where does the Bible claim to be the pillar of truth? Of course, the Bible is an infallible source of God’s Word, but is it the foundation of all truth? Answer: No.
The Bible itself says that the Church is the pillar and foundation of truth. (1 Timothy 3:15)
The Bible itself says to “…hold the traditions which you have learned, whether by word, or by our epistle.” (2 Thes. 2:14)
No where does the Bible claim to be the only teacher of the Christian faith. It explicitly states otherwise.