{29} Behold, I shew you a {d} mystery; We shall not all sleep, but we shall all be changed,

(29) He goes further, declaring that it will come to pass that those who will be found alive in the latter day will not descend into that corruption of the grave, but will be renewed with a sudden change, which change is very necessary. And he further states that the certain enjoying of the benefit and victory of Christ, is deferred to that latter time.

(d) A thing that has been hid, and never known before now, and therefore worthy that you give good care to it.

People's New Testament

15:51 Behold, I shew you a mystery. I disclose to you a secret of which you have had, hitherto, no knowledge.

We shall not all sleep. There will be some on the death who shall be alive when Christ comes.

But we shall all be changed. The living who meet Christ, as well as the dead who are raised up. All shall be made immortal and incorruptible.

Wesley's Notes

15:51 A mystery - A truth hitherto unknown; and not yet fully known to any of the sons of men. We - Christians. The Apostle considers them all as one, in their succeeding generations. Shall not all die - Suffer a separation of soul and body. But we shall all - Who do not die, be changed - So that this animal body shall become spiritual.

Scofield Reference Notes

Margin mystery

See Scofield Note: "Mt 13:11".

Jamieson-Fausset-Brown Bible Commentary

51. Behold-Calling attention to the "mystery" heretofore hidden in God's purposes, but now revealed.

you-emphatical in the Greek; I show (Greek, "tell," namely, by the word of the Lord, 1Th 4:15) YOU, who think you have so much knowledge, "a mystery" (compare Ro 11:25) which your reason could never have discovered. Many of the old manuscripts and Fathers read, "We shall all sleep, but we shall not all be changed"; but this is plainly a corrupt reading, inconsistent with 1Th 4:15, 17, and with the apostle's argument here, which is that a change is necessary (1Co 15:53). English Version is supported by some of the oldest manuscripts and Fathers. The Greek is literally "We all shall not sleep, but," &c. The putting off of the corruptible body for an incorruptible by an instantaneous change will, in the case of "the quick," stand as equivalent to death, appointed to all men (Heb 9:27); of this Enoch and Elijah are types and forerunners. The "we" implies that Christians in that age and every successive age since and hereafter were designed to stand waiting, as if Christ might come again in their time, and as if they might be found among "the quick."

Matthew Henry's Concise Commentary

15:51-58 All the saints should not die, but all would be changed. In the gospel, many truths, before hidden in mystery, are made known. Death never shall appear in the regions to which our Lord will bear his risen saints. Therefore let us seek the full assurance of faith and hope, that in the midst of pain, and in the prospect of death, we may think calmly on the horrors of the tomb; assured that our bodies will there sleep, and in the mean time our souls will be present with the Redeemer. Sin gives death all its hurtful power. The sting of death is sin; but Christ, by dying, has taken out this sting; he has made atonement for sin, he has obtained remission of it. The strength of sin is the law. None can answer its demands, endure its curse, or do away his own transgressions. Hence terror and anguish. And hence death is terrible to the unbelieving and the impenitent. Death may seize a believer, but it cannot hold him in its power. How many springs of joy to the saints, and of thanksgiving to God, are opened by the death and resurrection, the sufferings and conquests of the Redeemer! In verse 58, we have an exhortation, that believers should be stedfast, firm in the faith of that gospel which the apostle preached, and they received. Also, to be unmovable in their hope and expectation of this great privilege, of being raised incorruptible and immortal. And to abound in the work of the Lord, always doing the Lord's service, and obeying the Lord's commands. May Christ give us faith, and increase our faith, that we may not only be safe, but joyful and triumphant.