Job 37:4

“After it a voice roareth, etc.] After the lightning comes a violent crack or clap of thunder, which is like the roaring of a lion. Such is the order of thunder and lightning, according to our sense and apprehension of them; otherwise in nature they are together: but the reasons given why the lightning is seen before, and so the same in the flash and report of a gun, are, because the sense of seeing is quicker than the sense of hearing f1268; and the motion of light is quicker than that of sound; which latter is the truest reason f1269. The roaring voice of thunder may be an emblem of the thunder of the law; its dreadful volleys of curses, vengeance, and wrath on the breakers of it, as…”

“The thunderclap follows at an interval after the flash. stay them--He will not hold back the lightnings (Job 37:3), when the thunder is heard [MAURER]. Rather, take "them" as the usual concomitants of thunder, namely, rain and hail [UMBREIT] (Job 40:9).”

“After it a voice roareth - After the lightning; that is, the flash is seen before the thunder is heard. This is apparent to all, the interval between the lightning and the hearing of the thunder depending on the distance. Lucretius, who has referred to the same fact, compares this with what occurs when a woodman is seen at a distance to wield an axe. The glance of the axe is seen long before the sound of the blow is heard: Sed tonitrum fit uti post antibus accipiamus, Fulgere quam cernunt ocuil, quia semper ad aures Tardius adveniunt, quam visum, guam moveant res. Nunc etiam licet id cognoscere, caedere si quem Ancipiti videas ferro procul arboris actum. Ante fit, ut cernas ictum, quam plaga…”

“After - After the lightning, which is seen before the thunder is hard. Them - The lightnings spoken of in the beginning of the verse. Job 37:6”

“a voice: Psa 29:3-9, Psa 68:33 the voice: Exo 15:7, Exo 15:8; Deu 33:26 he will: Job 36:27-33 Job 37:5”