Section 142Omnibus Election Code of the Philippines (Batas Pambansa Blg. 881), Sec. 142

Petition for exclusion of voters from the list. - Any registered voter in a city or municipality may apply at any time except during the period beginning with the twenty-first day after the last registration day of any election up to and including election day with the proper municipal or metropolitan trial court, for the exclusion of a voter from the list, giving the name and residence of the latter, the precinct in which he is registered, and the grounds for the challenge. The petition shall be sworn to and accompanied by proof of notice to the board of election inspectors concerned, if the same is duly constituted, and to the challenged voters.