The Pennsylvania Oath of Subscribing Witness is an oath that is administered to a witness who is signing a legal document in the state of Pennsylvania. The oath is an acknowledgment that the witness has seen the document, knows the identity of the signatory, and believes the signatory is of sound mind and signing the document voluntarily. There are two types of Pennsylvania Oath of Subscribing Witness: the Standard Oath and the Notary Public Oath. The Standard Oath requires the witness to swear that he or she has seen the signatory sign the document, knows the signatory, and believes the signatory is of sound mind and signing the document voluntarily. The Notary Public Oath requires the witness to swear that he or she has seen the signatory sign the document, knows the signatory, and believes the signatory is of sound mind and signing the document voluntarily before the notary public.