John Lightfoot on Luke 16:29

[They have Moses and the prophets.] The historical books also are comprehended under the title of the Prophets, according to the common acceptation of the Jews, and the reading in their synagogues: "All the books of the Prophets are eight; Joshua, Judges, Samuel, the Kings, Jeremiah, Ezekiel, Isaiah, and the twelve." So the Gemara also reckons them. So we find the Octateuch of the Prophets, as well as the Pentateuch of Moses, in Photius; of which we have spoken elsewhere.

But are the Hagiographa excluded, when mention is made only of the law and the prophets? Our Saviour speaks after the usual manner of their reading Moses and the Prophets in their synagogues; where every ordinary person, even the most rude and illiterate, met with them, though he had neither Moses nor the prophets nor the Hagiographa at his own house. Indeed, the holy writings, were not read in the synagogues (for what reason I will not dispute in this place), but they were, however, far from being rejected by the people, but accounted for divine writings, which may be evinced, besides other things, even from the very name. Our Saviour therefore makes no mention of them, not because he lightly esteems them, but because Moses and the prophets were heard by every one every sabbath day; and so were not the Hagiographa.