A couple of weeks ago in the Wt. study, one paragraph in particular captured my attention. The paragraph was talking about the prophet Daniel, who was still active and having a good bible study at the age of 90+
What captured my attention was this: the paragraph said there was indication (in what he wrote evidently) that he was studying parts of the bible we now know as Leviticus, Isaiah, Jeremiah, Hosea and Amos! The paragraph then gives a (well known) example of Daniel quoting Jeremiah’s prophecy about the 70 years of captivity in Babel.
What I wanted to know is the rest of it, the other parts that Daniel was studying, and here’s what I found after some digging 
Article not complete!
Leviticus: We all know the famous stand that the 4 young friends took when taken to Babel. They refused to eat any foods that were forbidden by the law (Le 11:4, 13, 47; 17:12). A second look, however shows that Daniel was a true student of the law even at his old age. In his apologetic prayer noted in Daniel Chapter 9, he refers back to the Law several times as he confesses the errors made by the people of Israel.
(Daniel 9:13) . . .Just as it is written in the law of Moses, all this calamity—it has come upon us, and we have not softened the face of Jehovah our God by turning back from our error and by showing insight into your trueness. . .
Isaiah:
*** kl chap. 2 p. 18 par. 17 ***
The fall of Babylon. Isaiah and Jeremiah both foretold Babylon’s fall to the Medes and the Persians. Remarkably, Isaiah’s prophecy about this event was recorded some 200 years before Babylon was conquered! The following aspects of prophecy are now matters of historical record: the drying up of the Euphrates River by diverting its waters to an artificial lake (Isaiah 44:27; Jeremiah 50:38); a careless lack of security at Babylon’s river gates (Isaiah 45:1); and the conquest by a ruler named Cyrus.—Isaiah 44:28.
Jeremiah:
Hosea:
Amos:
