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Job 3:8ESV·author unknown

Let those curse it who curse the day, who are ready to rouse up Leviathan.

Matthew Henry Presbyterian @wholebiblehenry

Long was Job's heart hot within him; and, while he was musing, the fire burned, and the more for being stifled and suppressed. At length he spoke with his tongue, but not such a good word as David spoke after a long pause: Lord, make me to know my end, Psa 39:3, Psa 39:4.

Commenting on Job 3:1-10

John Gill Reformed Baptist @doctorgill

Let them curse it that curse the day,.... 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...

Jamieson-Fausset-Brown Reformed @jfbcommentary

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...