64 Pa. Stat. § 69
Before any warrant issues from the land office for any land within the said purchase, the person for whose use and in whose name such warrant is applied for, shall declare upon oath or affirmation, in addition to the usual proof required by the officers of the land office to be taken and subscribed before some one of the judges of the court of common pleas, or justice of the peace of the county in which such lands lie, or before the secretary of the land office, that according to the best knowledge and belief of the deponent, no warrant or other office right had issued for such land in the name of such deponent or of any person or persons under whom he claims, and if at any time thereafter it should appear that the persons deposing as aforesaid, or any of them, shall knowingly have sworn falsely, such person or persons all suffer all the pains and penalties of perjury.
64 P.S. § 69