The final of the three divisions of the Hebrew Bible is known as the Writings. This section is made up of thirteen books: Ruth, Psalms, Job, Proverbs, Ecclesiastes, Song of Solomon, Lamentations, Daniel, Esther, Ezra-Nehemiah, and Chronicles. Like Samuel and Kings, Ezra and Nehemiah were combined into one book, and so also were 1 and 2 Chronicles.
As already mentioned, the Old Testament was frequently referred to in the New Testament as the “Law and the Prophets.” But there is one occasion in which Jesus referred to the Old Testament as “the Law of Moses, the Prophets, and the Psalms” (Luke 24:44).
In this instance, the Writings are referred to by their largest book: Psalms.