God promised to send a Redeemer to save sinful humans. Genesis 3:14-15

14 So the Lord God said to the serpent, 
“Because you have done this, 
“Cursed are you above all livestock
    and all wild animals!
You will crawl on your belly
    and you will eat dust
    all the days of your life.
15 And I will put enmity
    between you and the woman,
    and between your offspring[a] and hers;
he will crush[b] your head,
    and you will strike his heel.”

The Redeemer would come through the family of Abraham and would bless all of the nations of the earth. Genesis 12:1-3

12 The Lord had said to Abram, 
“Go from your country, your people and your father’s household to the land I will show you. 
2 “I will make you into a great nation,
    and I will bless you;
I will make your name great,
    and you will be a blessing.[a]
3 I will bless those who bless you,
    and whoever curses you I will curse;
and all peoples on earth
    will be blessed through you.”

The Redeemer would come through the line of Judah.  His rule would bring Peace. Genesis 49:8-10

8 “Judah, your brothers will praise you;
    your hand will be on the neck of your enemies;
    your father’s sons will bow down to you.
9 You are a lion’s cub, Judah;
    you return from the prey, my son.
Like a lion he crouches and lies down,
    like a lioness—who dares to rouse him?
10 The scepter will not depart from Judah,
    nor the ruler’s staff from between his feet, 
until he to whom it belongs shall come
    and the obedience of the nations shall be his.

The Redeemer would be a Prophet like Moses, but greater than Moses. Deuteronomy 18:18

¹⁸ I will raise up for them a prophet like you from among their fellow Israelites, and I will put my words in his mouth. He will tell them everything I command him.

The Redeemer would be a priest like Melchizedek, but a perfect Priest. Psalm 110:4

The Lord has sworn
    and will not change his mind:
“You are a priest forever,
    in the order of Melchizedek.”

The Redeemer be a King like David, but the everlasting King. 2 Sam 7:11-12, 16

“‘The Lord declares to you that the Lord himself will establish a house for you: 
12 When your days are over and you rest with your ancestors, 
I will raise up your offspring to succeed you, your own flesh and blood, 
and I will establish his kingdom…
 16 Your house and your kingdom will endure forever before me; 
your throne will be established forever.’”

The Redeemer would be God incarnate. Isaiah 9:1-2, 6-7

Nevertheless, there will be no more gloom for those who were in distress. In the past he humbled the land of Zebulun and the land of Naphtali, but in the future he will honor Galilee of the nations, by the Way of the Sea, beyond the Jordan—
2 The people walking in darkness
    have seen a great light;
on those living in the land of deep darkness
    a light has dawned…
6 For to us a child is born,
    to us a son is given,
    and the government will be on his shoulders.
And he will be called
    Wonderful Counselor, Mighty God,
    Everlasting Father, Prince of Peace.
7 Of the greatness of his government and peace
    there will be no end.
He will reign on David’s throne
    and over his kingdom,
establishing and upholding it
    with justice and righteousness
    from that time on and forever.
The zeal of the Lord Almighty
    will accomplish this.

The Redeemer would be born to a virgin. Isaiah 7:14

¹⁴ Therefore the Lord himself will give you a sign: The virgin will conceive and give birth to a son, and will call him Immanuel. 

The Redeemer would be born in Bethlehem of Judah. Micah 5.2, 4

2 But you, Bethlehem Ephratha,
    though you are small among the clans[b] of Judah,
out of you will come for me
    one who will be ruler over Israel,
whose origins are from of old,
    from ancient times.” 
4 He will stand and shepherd his flock
    in the strength of the Lord,
    in the majesty of the name of the Lord his God.
And they will live securely, for then his greatness
    will reach to the ends of the earth.

The Redeemer would be announced by a rising star. Numbers 24.15-17

“The prophecy of Balaam son of Beor,
    the prophecy of one whose eye sees clearly,
16 the prophecy of one who hears the words of God,
    who has knowledge from the Most High,
who sees a vision from the Almighty,
    who falls prostrate, and whose eyes are opened:
17 “I see him, but not now;
    I behold him, but not near.
A star will come out of Jacob;
    a scepter will rise out of Israel.

The Redeemer will rule with justice, might, and tenderness. Isaiah 40:9-11

“All people are like grass,
    and all their faithfulness is like the flowers of the field.
7 The grass withers and the flowers fall,
    because the breath of the Lord blows on them.
    Surely the people are grass.
8 The grass withers and the flowers fall,
    but the word of our God endures forever.”
9 You who bring good news to Zion,
    go up on a high mountain.
You who bring good news to Jerusalem,[c]
    lift up your voice with a shout,
lift it up, do not be afraid;
    say to the towns of Judah,
    “Here is your God!”
10 See, the Sovereign Lord comes with power,
    and he rules with a mighty arm.
See, his reward is with him,
    and his recompense accompanies him.
11 He tends his flock like a shepherd:
    He gathers the lambs in his arms
and carries them close to his heart;
    he gently leads those that have young.

The Redeemer bring salvation to all who will call upon His name. Isaiah 44:6-7

“This is what the Lord says—
    Israel’s King and Redeemer, the Lord Almighty:
I am the first and I am the last;
    apart from me there is no God.
7 Who then is like me? Let him proclaim it.
    Let him declare and lay out before me
what has happened since I established my ancient people,
    and what is yet to come—
    yes, let them foretell what will come.
8 Do not tremble, do not be afraid.
    Did I not proclaim this and foretell it long ago?
You are my witnesses. Is there any God besides me?
    No, there is no other Rock; I know not one.”

Praise be to God for His Indescribable Gift! Galatians 4:4-7, Luke 2

⁴ But when the set time had fully come, God sent his Son, born of a woman, born under the law, ⁵ to redeem those under the law, that we might receive adoption to sonship.⁶ Because you are his sons, God sent the Spirit of his Son into our hearts, the Spirit who calls out, “Abba,^[c] Father.” ⁷ So you are no longer a slave, but God’s child; and since you are his child, God has made you also an heir.