(2) An elector, if required by the presiding officer or the poll clerk shall, before receiving his or her ballot paper, take an oath in the form set out as Form 21 in Schedule 3, and if he or she refuses to take the same, erasing lines shall be drawn through his or her name on the official list of electors and in the poll book, if such name has been entered in the said book, and the words “refused to be sworn” shall be written thereafter.