Bede : "And he commanded that the children of Judah be taught the bow, etc." [2 Samuel 1:18] This was written about David when he was mourning the deaths of Saul and Jonathan: And he commanded that the children of Judah be taught the bow, he did this because he knew that the Philistines abounded in archers, and Saul had perished particularly by their arrows, so he wanted his soldiers to learn the same art of war to defeat them. As for the following: As it is written in the book of the just, they assert that the very book cannot be found anywhere today, not even among the Hebrews, just as the book of the wars of the Lord mentioned in the book of Numbers; nor the songs of Solomon, nor his wisest discussions on the nature of trees, all herbs, likewise beasts, birds, reptiles, and fish; or what is said in the book of the Chronicles: The rest of Solomon's deeds, former and later, are written in the words of Nathan the prophet, and in the books of Ahijah the Shilonite. In the vision of Iddo the seer against Jeroboam son of Nebat (II Chron. IX), and many such volumes which are proven to have existed in Scripture but are acknowledged as no longer extant today. Judah was indeed ravaged by the Chaldeans, and even the library, formerly gathered, was consumed by enemy fire along with other provincial treasures. From this, the few books that now remain in the holy Scriptures were later restored through the efforts of Ezra the priest and prophet. Hence it is written about him: Ezra went up from Babylon, and he was a ready scribe in the law of Moses (I Esdras VII). Ready indeed, because he discovered quicker forms of letters than the Hebrews had up to that time. And in the letter of the king of Persia: Artaxerxes, king of kings, to Ezra the priest, the most learned scribe of the law of the God of heaven, greetings (Ibid.). — Questions on the Book of Kings #7