Which long for death - Whose pain and anguish are so great that they would regard it as a privilege to die. Much as people dread death, and much as they have occasion to dread what is beyond, yet there is no doubt that this often occurs. Pain becomes so intense, and suffering is so protracted, that they would regard it as a privilege to be permitted to die. Yet that sorrow "must" be intense which prompts to this wish, and usually must be long continued. In ordinary cases such is the love of life, and such the dread of death and of what is beyond, that people are willing to bear all that human nature can endure rather than meet death; see the notes at Job 2:4. This idea has been expressed with unsurpassed beauty by Shakespeare:
For who would bear the whips and scorns of time,
The oppressor's wrong, the proud man's contumely
The pangs of despised love. the law's delay,
The insolence of office. and the spurns
That patient merit of the unworthy takes,
When be himself might his quietus make
With a bare bodkin? Who would fardels bear,
To grunt and sweat under a weary life,
But that the dread of something after death -
The undiscovered country, from whose bourne
No traveler returns-puzzles the will;
And makes us rather bear those ills we have,
Than fly to others that we know not of.
Hamlet.
And dig for it - That is, express a stronger desire for it than people do who dig for treasures in the earth. Nothing would more forcibly express the intense desire to die than this expression.

Which long for death - They look to it as the end of all their miseries; and long more for a separation from life, than those who love gold do for a rich mine.

Which long for death, but it cometh not,.... Who earnestly desire, wistly look out, wish for, and expect it, and with open mouth gape for it, as a hungry man for his food, or as the fish for the bait, or the fishermen for the fish, as some (a) observe the word may signify; but it comes not to their wish and expectation, or so soon as they would have it; the reason is, because the fixed time for it is not come, otherwise it will certainly come at God's appointed time, and often in an hour not thought of; death is not desirable in itself, being a dissolution of nature, or as it is the sanction of the law, or the wages of sin, or a penal evil; and though it is and may be lawfully desired by good men, that they may be free from sin, and be in a better capacity to serve the Lord, and that they may be for ever with him; yet such desires should be expressed with submission to the divine will, and the appointed time should be patiently waited for, and should not be desired merely to be rid of present afflictions and troubles, which was the case of Job, and of those he here describes; see Revelation 9:6,
and dig for it more than for hid treasures; which are naturally hid in the earth; as gold and silver ore, with other metals and precious stones; or which are of choice concealed there from the plunder of others; the former seems rather to be meant, and in digging for which great pains, diligence, and industry, are used, see Proverbs 2:4; and is expressive of the very great importunity and strong desire of men in distressed circumstances after death, seeking diligently and pressing importunately for it; the sin of suicide not being known, or very rare, in that early time, or however was shunned and abhorred even by those that were most weary of their lives: some render it, "who dig for it out off hid treasures" (b); out of the bowels of the earth, and the lowest parts of it, could they but find it there: but the Targum, Jarchi, and others, understand it comparatively, as we do.
(a) So Junius & Tremellius, Piscator. vid. Schultens in loc. (b) "e thesauris", Cocceius; "ex imis terrae latebris", Mercerus: "ex locis absconditis", Schmidt.

Dig - Desire with as much earnestness as men dig for treasure: but it is observable, Job durst not do anything to hasten or procure his death: notwithstanding all his miseries, he was contented to wait all the days of his appointed time, 'till his change came, Job 14:14.