Job 3:8

“Let them curse it that curse the day, etc.] Their own day, either their birthday, or any day on which evil befalls them; and now such as are used to this, Job would have them, while they were cursing their own day, to throw some curses upon his; or that curse the daylight in general, as adulterers and murderers, who are said to rebel against the light, (see <182413> Job 24:13,17); and as some Ethiopians, who lived near Arabia, and so known to Job, who supposed there was no God, and used to curse the sun when it rose and set, as various writers relate f106, called by others f107 Atlantes; or it may design such persons who were hired at funerals, to mourn for the dead, and who, in their…”

“them . . . curse the day--If "mourning" be the right rendering in the latter clause of this verse, these words refer to the hired mourners of the dead (Jer 9:17). But the Hebrew for "mourning" elsewhere always denotes an animal, whether it be the crocodile or some huge serpent (Isa 27:1), such as is meant by "leviathan." Therefore, the expression, "cursers of day," refers to magicians, who were believed to be able by charms to make a day one of evil omen. (So Balaam, Num 22:5). This accords with UMBREIT'S view (Job 3:7); or to the Ethiopians and Atlantes, who "used to curse the sun at his rising for burning up them and their country" [HERODOTUS]. Necromancers claimed power to control or…”

“Let them curse it who curse the day - This entire verse is exceedingly difficult, and many different expositions have been given of it. It seems evident that it refers to some well-known class of persons, who were accustomed to utter imprecations, and were supposed to have the power to render a day propitious or unpropitious - persons who had the power of divination or enchantment. A belief in such a power existed early in the world, and has prevailed in all savage and semi-barbarous nations, and even in nations considerably advanced in civilization. The origin of this was a desire to look into futurity; and in order to accomplish this, a league was supposed to be made with the spirits of…”

“The day - Their birth - day: when their afflictions move them to curse their own birth - day, let them remember mine also, and bestow some curses upon it. Mourning - Who are full of sorrow, and always ready to pour out their cries, and tears, and complaints. Job 3:9”

“3:8 The expression experts at cursing refers to professional cursers such as Balaam (Num 22–24).”

“who are ready: Ch2 35:25; Jer 9:17, Jer 9:18; Amo 5:16; Mat 11:17; Mar 5:38 their mourning: or, a leviathan, Job 41:1, Job 41:10 Job 3:9”