This is a Christmas chant which has been adapted to a polyphonic / homophonic melody. The background image is Bartolome Esteban Murillo’s “Adoration of the Shepherds”. Here follows the English and Latin words to this shortened version:
O magnum mysterium, et admirabile sacramentum,
ut animalia viderent Dominum natum,
jacentem in praesepio! Alleluia!
O great mystery, and wonderful sacrament,
that animals should see the new-born Lord,
lying in a manger! Alleluia!