The Messiah (Christ) is the Word of God (Jn 1:1) and so it should come as no surprise that He is described in every Old Testament book!

In Genesis He is the Seed of the woman (Ge 3:15).

In Exodus He is the Lamb of God for sinners slain (Ex 12:5, 6, 7, 11).

In Leviticus He is our High Priest (the whole book).

In Numbers He is the Star out of Jacob (Nu 24:17).

In Deuteronomy He is the Prophet like unto Moses (Dt 18:15).

In Joshua He is the Captain of the Lord’s armies (Josh 5:13, 14, 15).

In Judges He is the Angel of the LORD or the messenger of Jehovah (Jdg 13:18, 19, 20, 21, 22, 23).

In Ruth He is our Kinsman-Redeemer (Chapter 3).

In Samuel, Kings and Chronicles He is the King of Kings and Lord of Lords (1Sa 8:1, 2, 3, 4, 5, 6, 7, 8, 9).

In Ezra, Nehemiah and Esther He is the sovereign Lord over all the kingdoms of the earth (entire books).

In Job He is our risen and returning Redeemer (Job 19:25).

In Psalms He is the Blessed Man (Psalm 1:1, 2, 3), the Son of Man (Psalm 2:2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12), the Crucified One (Psalm 22), the Coming One (Psalm 24), the Reigning One (Psalm 72).

In Proverbs He is our Wisdom (Pr 14).

In Ecclesiastes He is the forgotten Wise Man (Eccl 9:14, 15).

In Song of Solomon He is my Beloved (Song 2:16).

In Isaiah He is our suffering Substitute (Isa 53).

In Jeremiah He is the LORD OUR RIGHTEOUSNESS (Jer 23:6).

In Lamentations He is the Man of sorrows who weeps for His people (Lam 1:12, 13, 14, 15, 16, 17, 18).

In Ezekiel He is the glory of God (Ezek 1:28).

In Daniel He is the Smiting Stone (Da 2:34) and the Companion in the furnace of fire and the den of lions (Da 3:24, 25; 6:22).

In Hosea He is David’s Greater King (Hos 3:5).

In Joel He is the Hope of His people (Joel 3:16).

In Amos He is the Rescuer of Israel (Amos 3:12).

In Obadiah He is the Deliverer upon Mount Zion (Oba 1:17).

In Jonah He is the buried and risen Saviour (compare Mt 12:40).

In Micah He is the Everlasting God born in Bethlehem (Mic 5:2).

In Nahum He is our Stronghold in the day of wrath (Nah 1:7).

In Habakkuk He is the Anchor of our faith (Hab 2:4).

In Zephaniah He is in the midst for judgment and cleansing (Zeph 3:5,15).

In Haggai He is Lord of presence and power (Hag 1:13).

In Zechariah He is the smitten Shepherd (Zech 13:7).

In Malachi He is the Sun of Righteousness (Mal 4:2).