From God Himself. God chose various people throughout history to write down what He wanted them to write. The book we call the Bible is actully a collection of all those writings from all those people.
All scriptures is given by God. And all scripture
is useful for teaching and for showing people
what is wrong in their lives. It is useful for co-
-rrecting faults and teaching the right way to
live. Using the Scrptures, those who serve God
Will be prepared and will have everything they
need to do every good work.(2Timothy3:16-17
No prophecy (that is, the Bible) ever came from what some person wanted to say. But people were led by the Holy Spirit and spoke words from God.(2Peter 1:21)