Luke 1:26-38: "In the sixth month the angel Gabriel was sent from God to a city of Galilee named Nazareth, to a virgin betrothed to a man whose name was Joseph, of the house of David. And the virgin's name was Mary. And he came to her and said, 'Greetings, O favored on, the Lord is with you!' But she was greatly troubled at the saying, and tried to discern what sort of greeting this might be. And the angel said to her, "Do not be afraid, Mary, for you have found favor with God. And behold, you will conceive in your womb and bear a son, and you shall call his name Jesus. He will be great and will be called the Son of the Most High. And the Lord God will give to him the throne of his father David, and he will reign over the house of Jacob forever, and of his kingdom there will be no end.'
"And Mary said to the angel, 'How will this be, since I am a virgin?'"
"And the angel answered her, 'The Holy Spirit will come upon you, and the power of the Most High will overshadow you; therefore the child to be born will be called holy - the Son of God. And behold, your relative Elizabeth in her old age has also conceived a son, and this is the sixth month with her who was called barren. For nothing will be impossible with God.' And Mary said, 'Behold, I am the servant of the Lord; let it be to me according to your word.' And the angel departed from her."
Isaiah 7:14: "'Therefore the Lord himself will give you a sign. Behold, the virgin shall conceive and bear a son, and shall call his name Immanuel.'"
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The text is public domain:
The angel Gabriel from heaven came,
With wings as drifted snow, with eyes as flame:
"All hail to thee, O lowly maiden Mary,
Most highly favored lady."
Gloria!
"For know a blessed mother thou shalt be,
All generations laud and honor three;
Thy son shall be Emmanuel, by seers foretold,
Most highly favored lady."
Gloria!
Then gentle Mary meekly bowed her head;
"To me be as it pleaseth God," she said.
"My soul shall laud and magnify God's holy name."
Most highly favored lady,
Gloria!
Of her, Emmanuel, the Christ, was born
In Bethlehem all on a Christmas morn,
And Christian folk throughout the world will ever say:
"Most highly favored lady."
Gloria!
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There's not much to say about this one. The Luke text is the main referent, and the Isaiah text seems to show up only in the second verse, specifically "Thy son shall be Emmanuel, by seers foretold," an appellation that also shows up in the last verse.
Mary's "My soul shall laud and magnify God's holy name" in the third verse is also from Luke, but a bit beyond the verses cited in the hymnal. The Magnificat begins at Luke 1:46: "And Mary said, 'My soul magnifies the Lord....'"
For the first two lines of the last verse, Luke 2 could be cited, specifically verses 4-7: "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, to be registered with Mary, his betrothed, who was with child. And while they were there, the time came for her to give birth. 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."