The meaning of Whale in the Bible
(From Easton's Bible Dictionary)

The Hebrew word tan (plural, tannin) is so rendered in Job 7:12 (A.V.; but RSV, "sea-monster"). It is rendered by "dragons" in Deuteronomy 32:33; Psalms 91:13; Jeremiah 51:34; Psalms 74:13 (marg., "whales;" and marg. of RSV, "sea-monsters"); Isaiah 27:1; and "serpent" in Exodus 7:9 (RSV marg., "any large reptile," and so in ver. 10,12). The words of (Job 7:12), uttered in bitter irony, where he asks, "Am I a sea or a whale?" simply mean, "Have I a wild, untamable nature, like the waves of the sea, which must be confined and held within bounds, that they cannot pass?" "The serpent of the sea, which was but the wild, stormy sea itself, wound itself around the land, and threatened to swallow it up...Job inquires if he must be watched and plagued like this monster, lest he throw the world into disorder" (Davidson's Job).

See more on the meaning of Whale in the Bible:
Whale {International Standard Bible Encyclopedia}

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