Isaiah 7:10-14: "Again the LORD spoke to Ahaz, 'Ask a sign of the LORD your God; let it be deep as Sheol or high as heaven.' But Ahaz said, 'I will not ask, and I will not put the LORD to the test.' And he said, 'Hear then, O house of David! Is it too little for you to weary men, that you weary my God also? Therefore the Lord himself will give you a sign. Behold, the virgin shall conceive and bear a son, and shall call his name Immanuel.'"
Isaiah 11:1-5: "There shall come forth a shoot from the stump of Jesse, and a branch from his roots shall bear fruit. And the Spirit of the LORD shall rest upon him, the Spirit of wisdom and understanding, the Spirit of counsel and might, the Spirit of knowledge and the fear of the LORD. And his delight shall be in the fear of the LORD. He shall not judge by what his eyes see, or decide disputes by what his ears hear, but with righteousness he shall judge the poor, and decide with equity for the meek of the earth; and he shall strike the earth with the rod of his mouth, and with the breath of his lips he shall kill the wicked. Righteousness shall be the belt of his waist, and faithfulness the belt of his loins."
Isaiah 11:10-11: "In that day the root of Jesse, who shall stand as a signal for the peoples - of him shall the nations inquire, and his resting place shall be glorious.
"In that day the Lord will extend his hand yet a second time to recover the remnant that remains of his people, from Assyria, from Egypt, from Pathros, from Cush, from Elam, from Shinar, from Hamath, and from the coastlands of the sea."
Matthew 1:23: "'Behold, the virgin shall conceive and bear a son, and they shall call his name Immanuel' (which means, God with us)."
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The text is public domain:
O come, O come, Emmanuel,
And ransom captive Israel,
That mourns in lonely exile here
Until the Son of God appear.
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel!
O come, Thou Wisdom from on high,
Who ord'rest all things mightily;
To us the path of knowledge show,
And teach us in her ways to go.
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel!
O come, O come, Thou Lord of might,
Who to Thy tribes on Sinai's height
In ancient times didst give the Law
In cloud and majesty and awe.
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel!
O come, Thou Branch of Jesse's tree,
Free them from Satan's tyranny
That trust Thy mighty pow'r to save,
And give them vict'ry o'er the grave.
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel!
O come, Thou Key of David, come,
And open wide our heav'nly home;
Make safe the way that leads on high,
And close the path to misery.
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel!
O come, Thou Dayspring from on high,
And cheer us by Thy drawing nigh;
Disperse the gloomy clouds of night,
And death's dark shadows put to flight.
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel!
O come, Desire of nations, bind
In one the hearts of all mankind;
Bid Thou our sad divisions cease,
And be Thyself our King of Peace.
Rejoice! Rejoice! Emmanuel
Shall come to thee, O Israel!
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The first verse seems to be a combination of the Isaiah 7 and Matthew texts (the name Immanuel) and the later section of the Isaiah 11 text. "Recover[ing] the remnant that remains of his people" is rendered as "ransom captive Israel" in the hymn text.
The first part of the Isaiah 11 text provides some of the vocatives that begin the verses: "Thou Wisdom from on high," "Thou Lord of might," and "Thou Branch of Jesse's tree." "Thou Dayspring from on high... [who] Disperse[s] the gloomy clouds of night, / And death's dark shadows put[s] to flight" seems to come from Zechariah's "the sunrise shall visit us from on high to give light to those who sit in darkness and in the shadow of death" from Luke 1:78-79. "King of Peace" from the last verse seems to be from Isaiah 9:6, specifically the appellation "Prince of Peace." The phrases aren't exactly the same, but they are similar.
"Who to Thy tribes on Sinai's height / In ancient times didst give the Law" in the third verse refers to God's giving Moses the Ten Commandments in Exodus 20. This isn't cited in the hymnal, but the lines in the hymn refer to the event generally rather than mentioning anything specific that could be cited with only a couple verses.
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The Lutheran Service Book has "who ord'rest all things" where Lutheran Worship has "who ordered all things." The past tense in the LW text almost implies a static nature where the present tense in the LSB text insures the understanding that God is still active in our lives. It's like Luther's explanation to the first article of the Apostles' Creed: "He has given me my body and soul, eyes, ears, and all my members, my reason and all my senses, and still takes care of them."
