Behold, he drinketh up a river. — This verse is better rendered, Behold, if a river overflow (or, is violent), he trembleth not (or, hasteneth not); he is confident, though Jordan swell up to his mouth.
Related Commentaries of Job 40:23
Job 40:23
23 Behold, he drinketh up a river, and hasteth not: he trusteth that he can draw up Jordan into his mouth.