We Hymn The Father, The Son, and The Holy Spirit

.. Let it be silent
Let the Luminous stars
not shine,
Let the winds (?) and all the noisy rivers die down;
And as we hymn the Father, the Son and the Holy Spirit,
Let all the powers add "Amen Amen"
Empire, praise always, and glory to God,
The sole giver of
good things,
Amen Amen

Click on the link in the title to find out more about what may be "the oldest known music notation and lyrics of a Christian hymn."

More about ancient Greek hymns (not all Christian) here.