O magnum mysterium
et admirabile sacramentum,
ut animalia viderent Dominum natum,
jacentem in præsepio.

Beata virgo, cujus viscera meruerunt
portare Dominum Christum, Alleluia!

Translation:

O great mystery
and wondrous sacrament,
that animals should see the newborn Lord
lying in their manger.

Blessed is the Virgin whose womb was worthy
to bear the Lord Jesus Christ. Alleluia!

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