"The Old Testament canon, with its various books and divisions, was the model used for the canonization of the New Testament. God always used men to canonize various books.
When the Jews in the New Testament refused the message of Christ, God raised up the apostles to go into the Greek world to have His New Testament Scriptures preserved for us. Realize that the Old Testament was written basically in Hebrew with some Aramaic, while the New Testament was written in Greek. The Greeks, not the Jews, were given the New Testament to preserve. However, God used the apostles to make the decision as to which books the Greek world would preserve.
When the New Testament is placed side by side with the Old Testament, the Bible is complete with seven divisions: the Law, Prophets, Psalms, Gospels, Acts, Epistles and Revelation.
Seven is the number of completion throughout the Bible. The number
seven has made its mark in the canonization of both the Old and New Testaments. Here is how.
The complete Old Testament is actually comprised of 22 scrolls (books), categorized under three divisions.
The Law included five books—Genesis through Deuteronomy.
The Prophets were organized in a special way. The books of Joshua through 2 Kings, excluding Ruth, are known as former prophets and were written on two scrolls. Joshua and Judges shared one scroll. 1 and 2 Samuel and 1 and 2 Kings shared one scroll. The 12 minor prophets were also written on one scroll. Adding in Isaiah, Jeremiah, Ezekiel and Daniel there are a total of seven books.
The Writings total 10 books. The books included are Psalms, Proverbs, Job, Song of Songs, Ruth, Lamentations, Ecclesiastes, Esther, Ezra/Nehemiah (one book) and 1 and 2 Chronicles (one book).
Together with the 27 books of the New Testament, there are actually 49 books of the Bible. The number 49 is a significant number that carries divine meaning. This number is seven times seven, showing absolute completion. The seven divisions of the Bible and the number of books is no accident. They are clearly there by design to show that the revelation of God is complete with 49 books."
How God Preserved the Bible