The following shall be the form of the oath to be taken by each inspector:

“I (John Doe) do swear (or affirm) that I will as an inspector duly attend the ensuing election (or primary) during the continuance thereof, and that I will not admit any person to vote, except such as I shall firmly believe to be registered and entitled to vote at such election (or primary), according to the provisions of the Constitution and laws of this Commonwealth, that I will not vexatiously delay or refuse to permit any person to vote whom I shall believe to be entitled to vote as aforesaid, that I will make a true and perfect return of the said election (or primary), and that I will in all things truly, impartially and faithfully perform my duties therein, to the best of my judgment and ability; and that I am not directly or indirectly interested in any bet or wager on the result of this election (or primary).”