Given the following reasoning and answer, what was the question? The relevant information is: In Judaism and Christianity, its authorship is attributed to a prophet who lived in the Assyrian Period and named himself in the first verse, Obadiah.
 The answer: Obadiah

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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The question Passage: In Judaism and Christianity, its authorship is attributed to a prophet who lived in the Assyrian Period and named himself in the first verse, Obadiah. His name means "servant of Yahweh".

Question: Based on this passage, who wrote the book of obadiah in the bible?