EXEGETICAL THEOLOGY > OLD TESTAMENT EXEGESIS > JONAH
ESV Introductions to the Books of the Bible
Because it tells of a fish swallowing a man, many have dismissed the book of Jonah as fiction. But 2 Kings 14:25 mentions Jonah as living during the time of Jeroboam II (about 793-753 b.c.), and Jesus referred to Jonah as a historical person (Matt. 12:39-41). Unlike other prophetic books, Jonah focuses on the prophet himself rather than on his message. When God sent Jonah to Nineveh he rebelled, was swallowed by a fish, repented, and fulfilled his mission after all. When Nineveh repented, the reason for Jonah’s rebellion became clear: he had feared that God would forgive the Ninevites; and when God did forgive them, Jonah resented it (4:1-3). The book lists no author, but only Jonah himself could have known all the facts it records.
Source: https://www.blueletterbible.org/study/intros/esv_intros.cfm#at_Jonah