That is incorrect. Please take note:
LUKE 24: THE ESTABLISHED CANON CONFIRMED BY CHRIST HIMSELF
1. "MOSES AND ALL THE PROPHETS" = THE HEBREW TANAKH (OT)
25 Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken: 26 Ought not Christ to have suffered these things, and to enter into his glory? 27And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself...
2. "THE SCRIPTURES" = THE TANAKH
30 And it came to pass, as he sat at meat with them, he took bread, and blessed it, and brake, and gave to them. 31 And their eyes were opened, and they knew him; and he vanished out of their sight. 32 And they said one to another, Did not our heart burn within us, while he talked with us by the way, and while he opened to us the Scriptures?...
3. "THE LAW OF MOSES, THE PROPHETS, AND THE PSALMS = THE TANAKH
44 And he said unto them, These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the Prophets, and in the Psalms, concerning me...
4. "THE SCRIPTURES" = THE TANAKH
45 Then opened he their understanding, that they might understand the Scriptures...
So Christ was in fact referring to the Hebrew canon, and both the apostles and Christ's enemies agreed that this was the Word of God.
Since about 400 B.C. the Hebrew canon had been established in Israel, and consisted on only 24 books (equivalent to our 39 books in the OT). They were grouped differently, but here is how they have stood in the Hebrew Tanakh.
TORAH = The Law of Moses = 5 books
NEVIIM (NEBIIM) = The Prophets = 8 books
KETUVIM (KETHUBIM) = The Psalms or the Writings = 11 books
Samuel, Kings, Chronicles, and Ezra-Nehemiah are single books. All twelve minor prophets are just one book.