Job 39:19 - Matthew Poole's English Annotations on the Holy Bible

Strength; either strength of body; or rather, courage and generous confidence, for which the horse is highly commended. With thunder, i.e. with snorting and neighing; in the making of which nereid the neck, in regard of the throat, which is within it, and a part of it, is a principal instrument; which noise may not unfitly be called thunder, because of the great vehemency and rage wherewith it is attended, and the great terror which it causeth, especially in war and battle, of which see Jeremiah 8:16; and compare 1 Samuel 12:17,18, where this very term of thundering is ascribed to a far lower and less terrible noise. Nor is this, as some allege, an improper speech, because this thunder or neighing is rather clothed with the neck, as being within it, than the neck with it; for nothing is more common in Scripture than to say that men are clothed with righteousness, humility, and other graces, which yet are in strictness of speech within the man, and not he within them. But because this word in this form is not elsewhere extant, some render it otherwise, with a mane, with a thick, and full and deep mane, as the phrase of being clothed with it implies; for this is mentioned by all writers of horses as a notable mark of a generous horse; which therefore they conceive would not be omitted here, where so many several properties and excellencies are described. And the verb raam, whence this comes, in the Syriac language signifies not only to thunder, but also to be high or lofty; which fitly agrees to the mane, which is in the highest part of the horse.