(one) will get (one's)
One will incur the punishment that one rightly deserves. Now please don't take out some sort of vigilante justice on Leo. He'll get his in the end, don't you worry. She cheated off me during the test? Oh, she'll get hers, alright!
He will get his.
and She will get hers.One will be punished for one's misdeeds. Jill: It seems like Fred can do any evil thing he wants. Jane: Don't worry. He'll get his. You may think you will always profit by your life of crime, but you'll get yours.