Behold he drinketh up a river - Margin, "oppresseth." The margin expresses the proper meaning of the Hebrew word, עשׁק ‛âshaq. It usually means to oppress, to treat with violence and injustice; and to defraud, or extort. But a very different sense is given to this verse by Bochart, Gesenius, Noyes, Schultens, Umbreit, Prof. Lee, and Rosenmuller. According to the interpretation given by them the meaning is, "The stream overfloweth, and he feareth not; he is secure, even though Jordan rush forth even to his mouth." The reference then would be, not to the fact that he was greedy in his mode of drinking, but to the fact that this huge and fierce animal, that found its food often on the land, and that reposed under the shade of the lotus and the papyrus, could live in the water as well as on the land, and was unmoved even though the impetuous torrent of a swollen river should overwhelm him.
The "names" by which this translation is recommended are a sufficient guarantee that it is not a departure from the proper meaning of the original. It is also the most natural and obvious interpretation. It is impossible to make good sense of the phrase "he oppresseth a river;" nor does the word used properly admit of the translation "he drinketh up." The word "river" in this place, therefore (נהר nâhâr), is to be regarded as in the nominative case to יעשׁק ya‛âshaq, and the meaning is, that when a swollen and impetuous river rushes along and bears all before it, and, as it were, "oppresses" everything in its course, he is not alarmed; he makes no effort to flee; he lies perfectly calm and secure. What was "remarkable" in this appears to have been, that an animal that was so much on land, and that was not properly a fish, should be thus calm and composed when an impetuous torrent rolled over him. The Septuagint appears to have been aware that this was the true interpretation, for they render this part of the verse, Ἐάν γέηται πλνμμύρα, κ.τ.λ. Ean genētai plēmmura, etc. - "Should there come a flood, he would not regard it." Our common translation seems to have been adopted from the Vulgate - "Ecceabsorbebit fluvium."
He trusteth that he can draw up Jordan into his mouth - Or, rather, "He is confident, i. e. unmoved, though Jordan should rush forth to his mouth." The idea is, that though the whole river Jordan should seem to pour down upon him as "if" it were about to rush into his mouth, it would not disturb him. Even such an impetuous torrent would not alarm him. Being amphibious, he would not dread what would fill a land animal with alarm. There is no evidence that the hippopotamus was ever found in the river Jordan, nor is it necessary to suppose this in order to understand this passage. The mention of the Jordan shows indeed that this river was known to the writer of this book, and that it was probably written by someone who resided in the vicinity. In speaking of this huge foreign animal, it was not unnatural to mention a river that was familiarly known, and to say that he would not be alarmed should such a river rush suddenly and impetuously upon him. Even though the hippopotamus is an inhabitant of the Nile, and was never seen in the Jordan, it was much more natural to mention this river in this connection than the Nile. It was better known, and the illustration would be better understood, and to an inhabitant of that country would be much more striking. I see no reason, therefore, for the supposition of Bechart and Rosenmuller, that the Jordan here is put for any large river. The illustration is just such as one would have used who was well acquainted with the Jordan - that the river horse would not be alarmed even though such a river should pour impetuously upon him.

Behold, he drinketh up a river - A similar mode of expression, and of precisely the same meaning, as that in Job 39:24 : "He swalloweth the ground with fierceness." No river can stop his course: he wades through all; stems every tide and torrent; and hurries not as though he were in danger.
He trusteth that he can draw up Jordan - Even when the river overflows its banks, it is no stoppage to him: though the whole impetuosity of its stream rush against his mouth, he is not afraid. Mr. Good has seized the true idea in his translation of this verse: -
"If the stream rage, he revileth not:
He is unmoved, though Jordan rush against his mouth."
From this mention of Jordan it is probable that the behemoth was once an inhabitant of the mountains, marshes, and woods, of the land of Palestine.

Behold, he drinketh up a river, (k) [and] hasteth not: he trusteth that he can draw up Jordan into his mouth.
(k) He drinks at leisure, and fears nobody.

Behold, he drinketh up a river, and hasteth not,.... The elephant is indeed a very thirsty animal, and drinks largely; the philosopher (l) says it drinks nine Macedonian bushels at a feeding, and that it will drink fourteen Macedonian measures of water at once, and eight more at noon; but to drink up a river seems to be too great an hyperbole; wherefore the words may be rendered, "Behold, let a river oppress him", or "bear" ever so hard upon him, and come with the greatest force and pressure on him (m), "he hasteth not" to get out of it; or he is not frightened or troubled, as the Targum; which agrees with the river horse, who walks into the river, and proceeds on in it, with the greatest ease and unconcernedness imaginable; now and then lifting up his head above water to take breath, which he can hold a long time; whereas the elephant cannot wade in the water any longer than his trunk is above it, as the philosopher observes (n); and Livy (o) speaks of fear and trembling seizing an elephant, when about to be carried over a river in boats;
he trusteth that he can draw up Jordan in his mouth; so bold and confident he is, and not at all disturbed with its rapidity; or "though Jordan", or rather any descending flowing stream, "gushes into his mouth", so Mr. Broughton: for perhaps Jordan might not be known by Job; nor does it seem to have any connection with the Nile, the seat of the river horse; which has such large holes in its nostrils, and out of which, water being swallowed down, he can throw it with great force. Diodorus Siculus (p) represents it as lying all day in the water, and employing itself at the bottom of it, easy, careless, and unconcerned.
(l) Aristot. ut supra. (l. 9. c. 56.) (m) Vid. Bochart. ut supra, (Apud Hierozic. par. 2. l. 5. c. 14.) col. 766. (n) Aristot. ut supra. (l. 9. c. 56.) Vid Aelian. l. 7. c. 15. (o) Hist. l. 21. c. 28. (p) Bibliothec. l. 1. p. 31. Isidor. Origin. l. 12. c. 6.

Rather, "(Though) a river be violent (overflow), he trembleth not"; (for though living on land, he can live in the water, too); he is secure, though a Jordan swell up to his mouth. "Jordan" is used for any great river (consonant with the "behemoth"), being a poetical generalization (see on Job 40:15). The author cannot have been a Hebrew as UMBREIT asserts, or he would not adduce the Jordan, where there were no river horses. He alludes to it as a name for any river, but not as one known to him, except by hearsay.

River - A great quantity of water, hyperbolically called a river. Hasteth not - He drinks not with fear and caution; but such is his courage, that he fears no enemy either by water or by land. He drinks as if he designed, to drink up the whole river. He mentions Jordan, as a river well known, in and nigh unto Job's land.