He preaches water and drinks wine.
More Hungarian Proverbs:
If it does not trickle, it will drop.Hungarian
He can see the splinter in another's eye but cannot see even the beam in his own.
Hungarian
The woman of a man without sorrows is almost a widow.
Hungarian
As one sows, so he reaps.
Hungarian
He likes it, as a goat likes the knife, that kills him.
Hungarian
He stands there like a donkey on the hill.
Hungarian