The oldest surviving Irish manuscript is a fragmentary copy of the Book of Psalms. Before they went into battle, Celtic armies carried it around their troops three times to ensure victory. While we would not endorse such a magical view of the Bible, surely reading it does make us ready for spiritual warfare and eventual victory.
There is also an ancient manuscript of the four gospels called The Book of Darrow. When monasteries were dissolved, the book was kept by a farmer named MacGeoghan who believed it would cure his sick cattle, so he poured water over it and made the cows drink the water. Again, we would quibble with his application; but we know the Word of God is like living water to those who consume it.