Much of the book of Deuteronomy. Though, as has been pointed out, the OT is full of nasty stuff completely with odds of what Christianity is supposed to be about, and the NT supercedes all the rules of acceptable smiting and slavery and raping.
At this point we need the Ganpati chap to expound his theory that what Jesus was preaching was the Eastern philosophy he'd learned in the 'wilderness'. I find it quite plausible really, seeing as the OT seems so obviously a handbook of the leadership of a primative tribal culture where stuff was generally done according to violence, then along comes Jesus saying how great it would be to be nice to people for a change. Radical stuff.