perjure

To knowingly and willfully make a false statement of witness while in court.

He perjured himself.

To cause to violate an oath or a vow; to cause to make oath knowingly to what is untrue; to make guilty of perjury; to forswear; to corrupt.

Want will perjure the ne'er-touched vestal.

To make a false oath to; to deceive by oaths and protestations.

And with a virgin innocence did pray / For me, that perjured her.

A perjured person.

He comes in like a perjure, wearing papers