This phrase is from the Spanish language.
obras pias
“pious works”
Obras Pías are charitable foundations for the support of hospitals, convents, missions, and schools, as well as chaplaincies, which were established during the Spanish colonial period and continued through the first part of the nineteenth century.
MGA KAHULUGAN SA TAGALOG
obras pias: mga gawaing pangkawanggawâ
obras pias: noong panahon ng Espanyol, ang pondo na nalilikom mula sa abuloy na pangkawanggawâ

gross misspelling: obreas peas