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All answers having "Old Testament prophet" as clue:

4 Character Answers:

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AMOS

EZRA

JOEL

ODED



5 Character Answers:

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HOSEA

MICAH

NAHUM

SAMUE



6 Character Answers:

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ELIJAH

ELISHA

ISAIAH

NATHAN

SAMUEL



7 Character Answers:

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EZEKIEL

OBADIAH



9 Character Answers:

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ZEPHANIAH