I'm quoting from the Protestant website what they exactly said, so you may get the idea more clearly.
2. Jesus implicitly rejected the Apocrypha as Scripture by referring to the entire accepted Jewish Canon of Scripture, “From the blood of Abel [Gen. 4:8] to the blood of Zechariah [2 Chron. 24:20], who was killed between the altar and the house of God; yes, I tell you, it shall be charged against this generation (Lk. 11:51; cf. Mt. 23:35).”
Abel was the first martyr in the Old Testament from the book of Genesis, while Zechariah was the last martyr in the book of Chronicles. In the Hebrew Canon, the first book was Genesis and the last book was Chronicles. They contained all of the same books as the standard 39 books accepted by Protestants today, but they were just arranged differently. For example, all of the 12 minor prophets (Hosea through Malachi) were contained in one book. This is why there are only 24 books in the Hebrew Bible today. By Jesus referring to Abel and Zachariah, He was canvassing the entire Canon of the Hebrew Scriptures which included the same 39 books as Protestants accept today. Therefore, Jesus implicitly rejected the Apocrypha as Scripture.