perjure

tehdä väärä vala, vannoa väärä vala puhekieltä To knowingly and willfully make a false statement of witness while in court.
puhekieltä 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.

He perjured himself.

Want will perjure the ne'er-touched vestal.

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

(rfquotek)