What to do when told not to do anything?
You do nothing.
Has God ever told him to do anything else? I'd be highly sceptical of anyone who told me that God told them to do anything! God doesn't usually intervene in people's lives to that extent. Challenge him on it.... tell him he's lying, and watch him squirm. Either way, you need to ask yourself if you want to have anything to do with someone who thinks God speaks to him.