Jon 1:17 (Hebrew_Bible_2:1). “And Jehovah appointed a great fish to swallow up Jonah.” מנּה does not mean to create, but to determine, to appoint. The thought is this: Jehovah ordained that a great fish should swallow him. The great fish (lxx κῆτος, cf. Mat 12:40), which is not more precisely defined, was not a whale, because this is extremely rare in the Mediterranean, and has too small a throat to swallow a man, but a large shark or sea-dog, canis carcharias, or squalus carcharias L., which is very common in the Mediterranean, and has so large a throat, that it can swallow a living man whole.
The miracle consisted therefore, not so much in the fact that Jonah was swallowed alive, as in the fact that he was kept alive for three days in the shark’s belly, and then vomited unhurt upon the land. The three days and three nights are not to be regarded as fully three times twenty hours, but are to be interpreted according to Hebrew usage, as signifying that Jonah was vomited up again on the third day after he had been swallowed (compare Est 4:16 with Est 5:1 and Tob. 3:12, 13, according to the Lutheran text).