Leviticus 26:39

39.And they that are left of you. This is another form of vengeance, that, although they may survive for a time, still they shall gradually pine away; and this may be referred both to those who go into captivity, and to those who shall remain in the land. He had before threatened that they should be destroyed either by famine or sword; but now lest they should boast that they had escaped, if they had not perished by a violent death, He pronounces that they also should die a lingering death; and He also declares the manner of it, viz., that He will fill their hearts with trembling, so that they should fly when none pursued them, (as Solomon also says, Proverbs 28:1,) and fear at the sound of a falling leaf. Thus He signifies that the ungodly shall be no better off, although free from external troubles, because they are afflicted internally by hidden torments; for although their audacity may proceed even to madness, still it cannot be but that their evil conscience should smite them continually. Their forgetfulness of God may sometimes stupify them; nay, they may seek to shake off all feeling; but, after God has suffered them thus to become brutalized, He presently interrupts their lethargy, and hurries them on so that they are their own executioners. This passage shews us that, the more strait-hearted the wicked are in their contempt of God, the weaker they become, so as to tremble at their own shadow; and this condition is far more wretched than to be cut off at a single blow.