What relevance does the Old Testament hold? Any key messages to understand from there?

Answer 1

Deuteronomy 6:4-5 is a good one:

"4 Hear, O Israel: The LORD our God, the LORD is one. [a] 5 Love the LORD your God with all your heart and with all your soul and with all your strength"

Answer 2

1. The Old Testament was written to give us the knowledge of sin. Paul says that in Romans 7 What shall we say then? Is the Law sin? May it never be! On the contrary, I would not have come to know sin except through the Law; for I would not have known about coveting if the Law had not said, "YOU SHALL NOT COVET."
2 The OT contains much of the prophesies of future things.
3. OT tells the "why" of Jesus' coming
4. OT Is profitable for doctrine, reproof, correction, instruction in righteousness. 2 Timothy 3:16 All Scripture is inspired by God and profitable for teaching, for reproof, for correction, for training in righteousness;
5. Greatest source on earth for ancient history.
I'm sure there are many more reasons.

Answer 3

“The time foreordained unto the peoples and kindreds of the earth is now come. The promises of God, as recorded in the holy Scriptures, have all been fulfilled. Out of Zion hath gone forth the Law of God, and Jerusalem, and the hills and land thereof, are filled with the glory of His Revelation. …

In the Book of Isaiah it is written: ‘Enter into the rock, and hide thee in the dust, for fear of the Lord, and for the glory of His majesty.’ No man that meditateth upon this verse can fail to recognize the greatness of this Cause, or doubt the exalted character of this Day – the Day of God Himself. This same verse is followed by these words: ‘And the Lord alone shall be exalted in that Day.’ This is the Day which the Pen of the Most High hath glorified in all the holy Scriptures.” -Baha’u’llah

Answer 4

For Jews, the Old Testament is the Bible. The whole thing is a key message.

For Christians, the saying of Augustine best describes it: "The New Testament lies concealed in the Old, the Old lies revealed in the New."

Answer 5

BIBLE BOOKS WRITTEN [ THE TIME AND THE PEOPLE AND WRITERS ];

Noah born year 1056 [ 126 years after Adam dies age 930 ], is age 600 at flood, Gen.7:6; lives 350 years after flood Gen.9:28,29; Noah's son Shem Gen.11:10,11 has 502 years after the flood [ of 600 years life ]. Abraham [ has 175 years of life, 25 years after Shem dies ], is age 75 Gen.12:4; 427 years after the flood to get the Promised Land Covenant. Moses is age 80, Exo.7:7; 12:40,41 430 years later, or 857 after the flood has half million Promised Land heirs to be in the promised land in 40 years to 897 years after the flood. Num.33:38,39 4oth year Aaron age 123 dies. Deut.1:3; 34:7; Moses death in 40th year, Moses life 1633 BCE less to age 120 is 1513 BCE born in Roman Empire #6, Egypt is #1.

Genesis, Job, Exodus, Leviticus, Numbers, Deuteronomy is compiled by Moses , 1553 to 1513 BCE.
Joshua writes. Josh 5:6,12,14; 1513 to 1512 BCE and Judges write 11:26 [ 300 ]; to 1212 BCE. Samuel 1183 BCE
Ruth, 1 Samuel 25:1 Samuel 1183 age 100 in 1083 dies. Saul 1117 is king less 40 years to 1077 BCE.2 Samuel. Nathan, Gad, David 1107 age 24 in 1083 is King age 30 in 1077 less 40 years is 1037 BCE.
1 Kings 6:1 Moses 1513 less 480 is 1033 Solomon is king 4 years had 36 years to 1Ki.11:42; to 997. 1077 to 997 BCE forPsalms, [ Psm. 90 1553 to 1513 Moses ]; Ecclesiastes & Songs of Solomon. 997 and next 18 kings 2 Kings, 1 Chronicles and 2 Chronicles 36:20-23 end in 606 BCE. Amos 829 to 777 BCE. Elijah 909 to 831, Naum 829, Jonah 800 to 750 BCE. Isaiah and Hosea 827 to 714 BCE. Zephhaniah 777 BCE. Micah 775 to 715 BCE.

1 and 2 kings if compiled by Jeremiah. Book of Jeremiah and his book of Lamentations 646 to 546 BCE. Joel 628 to 606 BCE. Habakkuk 625 BCE. Obadiah 607 BCE. Book of Ezekiel by Ezekiel to 576 BCE. Book of Daniel by Daniel 606 to 536 and Cyrus #4 Empire Dan.10:1; year 533 BCE. Ester and Mordecai 486 to 475 Ezra, Nehemiah, Zechariah and Haggai 537 to 443 BCE. Malachi 475 to 443 BCE.

Matthew 55 CE
Mark is John Mark - CE
Luke 60 CE
John 90 CE
Acts by Luke - 65 CE

Romans, 1 Corinthians, 2 Corinthians, Galatians, Ephesians, Philippians, Colossians, 1 Thessalonians, 2 Thessalonians, 1 Timothy, 2 Timothy, Titus, Philemon, Hebrews all by Paul 50 - 70 CE

James 45 CE.
1 Peter, 2 Peter 60 CE
1 John, 2 John, 3 John 90 CE
Jude 60 CE
Revelation by John 98 CE.

Answer 6

Yes but there is not enough time or space to go into to it here.Keep looking.One clue,without it the new testament would be relatively meaningless.