Gloria in excelsis Deo

"Gloria in excelsis Deo" (Latin for "Glory to God in the highest") is a Christian hymn known also as the Greater Doxology (as distinguished from the "Minor Doxology" or Gloria Patri) and the Angelic Hymn[1][2]/Hymn of the Angels.[3] The name is often abbreviated to Gloria in Excelsis or simply Gloria.

The melody in neume notation

The hymn begins with the words that the angels sang when announcing the birth of Christ to shepherds in Luke 2:14 (in Latin). Other verses were added very early, forming a doxology.[4]

An article by David Flusser links the text of the verse in Luke with ancient Jewish liturgy.[5]