Deuteronomy 28:34 in the King James Version
So that thou shalt be mad for the sight of thine eyes which thou shalt see.
Context
33 A nation which you don’t know will eat the fruit of your ground and all of your work. You will only be oppressed and crushed always,
34 so that the sights that you see with your eyes will drive you mad.
35 The LORD will strike you in the knees and in the legs with a sore boil, of which you cannot be healed, from the sole of your foot to the crown of your head.