Beaten with his own rod.
More Japanese Proverbs:
Though the blind man cannot see it, light remains light.Japanese
Do not stay too long when the husband is not home.
Japanese
The consequence is the reward of the cause.
Japanese
Great villainy is often called loyalty.
Japanese
To ask is a temporary shame; not to ask, an eternal one.
Japanese
Never watch a bonfire wearing a straw coat.
Japanese