10 ILCS 5/13-8

Before any vote is taken, the judges of the election shall severally subscribe and take an oath or affirmation, in the following form: "I do solemnly swear (or affirm, as the case may be), that I will support the Constitution of the United States and the Constitution of the State of Illinois, and that I will faithfully discharge the duties of the office of judge of election, according to the best of my ability, and (in the case of a registered voter, that I am entitled to vote at this election)."