Omnibus Election Code
Section 132. Preservation of voter's affidavits. - A copy of the affidavit of each voter shall be kept by the board of election inspectors until after the election when it shall deliver the same to the election registrar together with the copies of the list of voters and other election papers for use in the next election. The election registrar shall compile the voter's affidavits by precinct alphabetically in a book of voters. The other two copies shall be sent by the board of election inspectors on the day following the date of the affidavit to the office of the provincial election supervisor and the Commission in Manila. The provincial election supervisor and the Commission shall respectively file and preserve the voter's affidavits by city and municipality and in alphabetical order of their surnames. The fourth copy shall be given to the voter as evidence of his registration.