In King James Bible:2nd Timothy chapter 3:16-17 It says:
All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness.so that the servant of God may be thoroughly equipped for every good work.
2nd Peter 1:21 says:
For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
The word Testament means covenant or agreement.The old testament is the covenant God made with man before Christ came and new Testament after Christ came. The Old Testament is the covenant of Law and the New Testament is covenant of Grace.
The Bible has total of 66 books, 39 of them from old testament out of that 5 are law of Moses,12 Historical,5 poetry ,17 Prophetical
New Testament has 27 Books 4 Gospels-Mathew,mark,Luke,John 1 church history: Acts of Holy spirit. There are 21 Epistles and 1 Prophesy which is The Apocalypse Revelation the Glorious appearance of second coming of Jesus Christ by John
There are 1189 chapters in the bible
Longest Chapter is Psalm 119
Longest Book is Psalms
Shortest Chapter is Psalm 117