Verse 3 of the popular (esp. Germany) late-mediaeval carol, Resonet in laudibus. The first three lines as shewn below are the unique verse, the others are portmanteau phrases from the original carol.
Pueri concinite
Nato regi psallite
Pia voce dicite:
Apparuit quem genuit Maria.
Sunt impleta quae praedixit Gabriel.
Eia, Eia, virgo Deum genuit
Quod divina voluit clementia.
Hodie apparuit
Apparuit in Israel
Ex Maria virgine natus est Rex!
Alleluia.
English translation
Sing together, children,
sing songs to the newborn King;
in pious tones, say:
He who was born of Mary appears.
Now we see fulfilled the word of Gabriel:
Eya, eya! The Virgin has given birth to God,
As the divine mercy willed.
Today appears,
Appears in Israel.
To the Virgin Mary is born the King!
Alleluya.