Jonah or Jonas is the name given in the Hebrew Bible (Tanakh/Old Testament) to a prophet of the northern kingdom of Israel in about the 8th century BCE. He is the eponymous central figure of the Book of Jonah, in which he is called upon by God to travel to Nineveh and warn its residents to repent of their sins or face divine wrath. Instead, Jonah boards a ship to Tarshish. Caught in a storm, he orders the ship's crew to cast him overboard, whereupon he is swallowed by a giant fish.

The Book of Jonah (Yonah yvnh) is one of the twelve minor prophets included in the Tanakh. According to one tradition, Jonah was the boy brought back to life by Elijah the prophet in 1 Kings 17. Another tradition holds that he was the son of the woman of Shunem brought back to life by Elisha in 2 Kings 4 and that he is called the "son of Amittai" (Truth) due to his mother's recognition of Elisha's identity as a prophet in 2 Kings 17:24. The Book of Jonah is read every year, in its original Hebrew and in its entirety, on Yom Kippur - the Day of Atonement, as the Haftarah at the afternoon mincha prayer. According to Rabbi Eliezer, the fish that swallowed Jonah was created in the primordial era and the inside of its mouth was like a synagogue; the fish's eyes were like windows and a pearl inside its mouth provided further illumination.  According to the Midrash, while Jonah was inside the fish, it told him that its life was nearly over because soon the Leviathan would eat them both. Jonah promised the fish that he would save them. Following Jonah's directions, the fish swam up alongside the Leviathan and Jonah threatened to leash the Leviathan by its tongue and let the other fish eat it. The Leviathan heard Jonah's threats, saw that he was circumcized, and realized that he was protected by the Lord, so it fled in terror, leaving Jonah and the fish alive.  Teshuva - the ability to repent and be forgiven by God - is a prominent idea in Jewish thought. This concept is developed in the Book of Jonah: Jonah, the son of truth (the name of his father "Amitai" in Hebrew means truth), refuses to ask the people of Nineveh to repent. He seeks the truth only, and not forgiveness. When forced to go, his call is heard loud and clear. The people of Nineveh repent ecstatically, "fasting, including the sheep," and the Jewish scripts are critical of this. The Book of Jonah also highlights the sometimes unstable relationship between two religious needs: comfort and truth.

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