Duo seraphim clamabant alter ad alterum:
Sanctus Dominus Deus Saboath.
Plena est omnis terra gloria ejus. (Isaiah 6:3)
Tres sunt, qui testimonium dant in coelo:
Pater, Verbum et Spiritus Sanctus:
et hi tres unum sunt.
Sanctus Dominus Deus Sabaoth.
Plena est omnis terra gloria ejus.
English translation
Two seraphim cried to one another:
Holy is the Lord God of Sabaoth.
The whole earth is full of his glory.
There are three who bear witness in heaven:
the Father, the Word, and the Holy Spirit:
and these three are one.
Holy is the Lord God of Sabaoth.
The whole earth is full of his glory.
English translations by John Kilpatrick; PDF and Word documents available as part of translation of Vespers of 1610 (Monteverdi)