Here are some examples for the expression:

Notary Forms
Signer must personally appear before the Notary. Signer must be positively identified by the Notary. Signer must acknowledge having willingly signed the ...
www.sos.state.ia.us/notaries/notary_forms.html


The National Notary Association Online - Become a Notary
However, the signer must appear before the Notary at the time of notarization to acknowledge that he or she freely signed for the purposes stated in the ...
www.nationalnotary.org/ resources/index.cfm?text=howtoFAQs

SORM -- Notary Public Information for State Employees
The person whose signature is notarized must personally appear before the notary at the time the notarization is performed. ...
www.sorm.state.tx.us/Notary/faq.htm