In short, from the bible, from many pages of the bible. Now there is not a verse/sentence that commands these three means of establishing bible authority, but they are the only three that we can see the bible using or referencing time and again. While there is not a “one verse quote” that can be given to show these three things necessary, there is a portion of one chapter that is a good example of how God enabled man with the ability and necessity to understand His will through the means of direct commands, approved examples, and necessary inference.
Acts 15:6-21…
