Unto you is born this day in the city of David a Savior, which is Christ the Lord.@Luke 2:11
Adoration of the Shepherds
Georges de La Tour (1593–1652)

15th Century carol; appeared in Christmas Carols New and Old, third series, by Henry R. Bramley & John Stainer (London: Novello, Ewer & Company, circa 1878), number 48.

A Babe Is Born 15th Century carol (🔊 pdf nwc).

John Stainer (1840–1901)

A Babe is born, all of a maid,
To bring salvation unto us;
No more are we to sing afraid,
Veni Creator Spiritus.

At Bethlehem, that blessèd place,
The Child of bliss then born He was;
Him aye to serve, God give us grace,
O Lux beata Trinitas.

There came three kings out of the East,
To worship there that King so free;
With gold and myrrh and frankincense,
A solis ortus cardine.

The shepherds heard an angel cry,
A merry song that night sang he,
Why are ye all so sore aghast?
Iam lucis orto sidere.

The angel came down with a cry,
A fair and joyful song sang he,
All in the worship of that child,
Gloria Tibi Domine.