Luke 2:1-20: "1 In those days a decree went out from Caesar Augustus that all the world should be registered. 2 This was the first registration when Quirinius was governor of Syria. 3 And all went to be registered, each to his own town. 4 And Joseph also went up from Galilee, from the town of Nazareth, to Judea, to the city of David, which is called Bethlehem, because he was of the house and lineage of David, 5 to be registered with Mary, his betrothed, who was with child. 6 And while they were there, the time came for her to give birth. 7 And she gave birth to her firstborn son and wrapped him in swaddling cloths and laid him in a manger, because there was no place for them in the inn.
"8 And in the same region there were shepherds out in the field, keeping watch over their flock by night. 9 And an angel of the Lord appeared to them, and the glory of the Lord shone around them, and they were filled with fear. 10 And the angel said to them, 'Fear not, for behold, I bring you good news of great joy that will be for all the people. 11 For unto you is born this day in the city of David a Savior, who is Christ the Lord. 12 And this will be a sign for you: you will find a baby wrapped in swaddling cloths and lying in a manger.' 13 And suddenly there was with the angels a multitude of the heavenly host praising God and saying, 14 'Glory to God in the highest, and on earth peace among those with whom he is pleased!'
"15 When the angels went away from them into heaven, the shepherds said to one another, 'Let us go over to Bethlehem and see this thing that has happened, which the Lord has made known to us.' 16 And they went with haste and found Mary and Joseph, and the baby lying in a manger. 17 And when they saw it, they made known the saying that had been told them concerning this child. 18 And all who heard it wondered at what the shepherds told them. 19 But Mary treasured up all these things, pondering them in her heart. 20 And the shepherds returned, glorifying and praising God for all they had heard and seen, as it had been told them."
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The text is public domain:
Infant holy,
Infant lowly,
For His bed a cattle stall;
Oxen lowing,
Little knowing
Christ the child is Lord of all.
Swiftly winging,
Angels singing,
Bells are ringing,
Tidings bringing:
Christ the child is Lord of all!
Christ the child is Lord of all!
Flocks were sleeping,
Shepherds keeping
Vigil till the morning new
Saw the glory,
Heard the story,
Tidings of a Gospel true.
Thus rejoicing,
Free from sorrow,
Praises voicing,
Greet the morrow:
Christ the child was born for you!
Christ the child was born for you!
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Since there's only one Biblical text cited and no other texts referenced in the hymn (none that I can see, anyway), I have nothing to add to this one.