the so-called biblical rods that the schatz had inside.lumbing supply tubes used to beat the children. and also important, a book was found inside, a book that appeared to light the fuse to the deadly brutality. the book is called "to train up a child." its author is this man on the tractor, michael pearl, and his wife, debi. they consider themselves observant christians who run an organization called no greater joy ministries from their tennessee farm. >> we'll, a preacher, a minister of the gospel. >> reporter: their book and others they have written stacked in a warehouse on their farm, all of them guided they say by the teachings in the bible. >> and it says if you spare the rod, you hate your child. but if you love him, you chasten him timely. >> reporter: a rod could be anything from a tree switch to a spatula. in the book they describe the rod as a magic wand. god would not have commanded parents to use the rod if it were not good for the child. the pearls say parents should stay in control and not act in extreme. but they also decl