Therefore this generation will be held responsible for the blood of all the prophets that has been shed since the beginning of the world, from the blood of Abel to the blood of Zechariah, who was killed between the altar and the sanctuary. Yes, I tell you, this generation will be held responsible for it all.
– Jesus, Luke 11:50-51
The Jewish Old Testament is divided into three different portions: The Torah (Torah), The Prophets (Nevi’ im) and the Writings (Ketivum). While the Old Testament contains all the books of the Tanakh, these books are not ordered like the Christian Old Testament. They are ordered into the three sections. The number of books is less because certain books were not divided into two books.
In the verses above, Jesus confirms the Scriptures that he was reading. The Jewish Tanakh started with Abel’s death in Genesis and ended with Zechariah’s death in 2 Chronicles 24: 20-21 (The Writings end the Tanakh). The process of OT canonization was completed between 200 BC and 200 AD, according to most scholars. Christianity took from Jewish tradition the list of books that Jesus read and began to use them as the basis for the Old and eventually the New Testament. However, I believe that it was probably set before Jesus makes his statements.