1 Thess 4:15-17 At the Second Coming of Christ, the Lord Himself shall descend from heaven with the voice of an Arch Angel, this voice of the Arch Angel is important because it links the OT Saints with the Second Coming here being described, this Arch Angel was associated with the Saints in the OT i.e Daniel 10:13,21 13 But the prince of the kingdom of Persia withstood me one and twenty days: but, lo, Michael, one of the chief princes, came to help me; and I remained there with the kings of Persia. 21 But I will shew thee that which is noted in the scripture of truth: and there is none that holdeth with me in these things, but Michael your prince. Dan 12:1 And at that time shall Michael stand up, the great prince which standeth for the children of thy people: and there shall be a time of trouble, such as never was since there was a nation even to that same time: and at that time thy people shall be delivered, every one that shall be found written in the book. For He had a special Responsibility for the Saints in that Nation. So at the Second Coming the dead in Christ shall rise first which will include all who died in faith since the beginning of the world, for even the OT Saints had their faith as the NT Saints in the Blood of Christ Rom 3:24-25 24 Being justified freely by his grace through the redemption that is in Christ Jesus: 25 Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God; Which blood bought the Church Acts 20:28 28 Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood. Remember what God told His People in the OT Jer 3:15 And I will give you pastors according to mine heart, which shall feed you with knowledge and understanding. Eph 4:11-12 11 And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers; 12 For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ: Well God was fulfilling that Promise , and this connects the OT Saints and NT Saints together and as being the Church of God, which He purchased with His own Blood ! Also by the presence of Moses [The Law and Elijah [The Prophets] on the Mt of Transfiguration it is recorded that while there, they spoke to Christ about what ? About His death He was about to accomplish in Jerusalem, this indicates that they were aware of their interest along with their believing contemporaries ! Lk 9:30-31 30 And, behold, there talked with him two men, which were Moses and Elias: 31 Who appeared in glory, and spake of his decease which he should accomplish at Jerusalem. So the dead in Christ that shall rise first will include Abraham, Isaac, Jacob, David, along with Jeremiah and Paul and Stephen, Silas,m Timothy, Titus, and Abel,m Seth, Ruth and on and on, and of course the Living Saints at this time will be caught up to meet them and the Lord in the air, for then cometh to past what was anticipated here Matt 25:1-13. Now the mentioning of the Voice of the Archangel, whom is Christ Himself, His Voice, shows us that the Church, His Bride were, all believing from all generations from the beginning of the World, and Now is the Day of Judgment spoken of here Rev 11:18 18 And the nations were angry, and thy wrath is come, and the time of the dead, that they should be judged, and that thou shouldest give reward unto thy servants the prophets, and to the saints, and them that fear thy name, small and great; and shouldest destroy them which destroy the earth.