身から出た錆 (みからでたさび): paying for one's mistakes; getting one's just deserts; suffering the consequences (of one's own actions)

paying for one's mistakes; getting one's just deserts; suffering the consequences (of one's own actions)

Trouble you made for yourself. The rust comes from the blade's own body, so there is nobody else to blame.

A Japanese proverb (ことわざ)