Ordo Lectionum Missae
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The Ordo Lectionum Missae (Known officially in English as Order of Readings for Mass[1][2][3]), commonly referred to as OLM, is the main liturgical lectionary used in the Roman Catholic Church. It contains the designated Scripture readings for the celebration of the Mass of Paul VI, encompassing selections (pericopes) from both the Old and New Testaments of the Bible.[4]