Council of Jamnia, a Jewish council, met to revise the Books of the Canon (or the Old Testament as it is known to Christians.) These were the criteria:
The books had to conform to the Pentateuch (the first five books).
The books had to be written in Hebrew.
The books had to be written in Palestine.
The books had to be written before 400 B.C..
One result is the removal of the 14 books known as the Apocrypha.