Here is some thoughts on clouds, and along the lines of Nathan's post re: cloud of witness, and this verse
1Co 6:2 Do ye not know that the saints shall judge the world? and if the world shall be judged by you, are ye unworthy to judge the smallest matters?
God's "coming on the clouds of heaven" is often a symbolic way of speaking of judgement
Isaiah 19:1 (NKJV) The burden against Egypt. Behold, the LORD rides on a swift cloud, And will come into Egypt; The idols of Egypt will totter at His presence, And the heart of Egypt will melt in its midst.
Nahum 1:3 (NKJV) The LORD is slow to anger and great in power, And will not at all acquit the wicked. The LORD has His way In the whirlwind and in the storm, And the clouds are the dust of His feet.
Mark 14:62 (NKJV) Jesus said, "I am. And you will see the Son of Man sitting at the right hand of the Power, and coming with the clouds of heaven."
Revelation 1:7 (NKJV) Behold, He is coming with clouds, and every eye will see Him, even they who pierced Him. And all the tribes of the earth will mourn because of Him. Even so, Amen.
Matthew 24:31 (NKJV) "And He will send His angels with a great sound of a trumpet, and they will gather together His elect from the four winds, from one end of heaven to the other.
Numbers 10:2 (NKJV) "Make two silver trumpets for yourself; you shall make them of hammered work; you shall use them for calling the congregation and for directing the movement of the camps.
Leviticus 25:9 (NKJV) 'Then you shall cause the trumpet of the Jubilee to sound on the tenth day of the seventh month; on the Day of Atonement you shall make the trumpet to sound throughout all your land.
Isaiah 27:12-13 (NKJV) And it shall come to pass in that day That the LORD will thresh, From the channel of the River to the Brook of Egypt; And you will be gathered one by one, O you children of Israel. 13 So it shall be in that day: The great trumpet will be blown; They will come, who are about to perish in the land of Assyria, And they who are outcasts in the land of Egypt, And shall worship the LORD in the holy mount at Jerusalem.
Isaiah 11:1-5 (NKJV) There shall come forth a Rod from the stem of Jesse, And a Branch shall grow out of his roots. 2 The Spirit of the LORD shall rest upon Him, The Spirit of wisdom and understanding, The Spirit of counsel and might, The Spirit of knowledge and of the fear of the LORD. 3 His delight is in the fear of the LORD, And He shall not judge by the sight of His eyes, Nor decide by the hearing of His ears; 4 But with righteousness He shall judge the poor, And decide with equity for the meek of the earth; He shall strike the earth with the rod of His mouth, And with the breath of His lips He shall slay the wicked. 5 Righteousness shall be the belt of His loins, And faithfulness the belt of His waist.
11 It shall come to pass in that day That the LORD shall set His hand again the second time To recover the remnant of His people who are left, From Assyria and Egypt, From Pathros and Cush, From Elam and Shinar, From Hamath and the islands of the sea. 12 He will set up a banner for the nations, And will assemble the outcasts of Israel, And gather together the dispersed of Judah From the four corners of the earth.
1 Corinthians 15:51-52 (NKJV) Behold, I tell you a mystery: We shall not all sleep, but we shall all be changed; 52 in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised incorruptible, and we shall be changed.
Mat 24:31 And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
Daniel 12:1-2 (NKJV) "At that time Michael shall stand up, The great prince who stands watch over the sons of your people; And there shall be a time of trouble, Such as never was since there was a nation, Even to that time. And at that time your people shall be delivered, Every one who is found written in the book. 2 And many of those who sleep in the dust of the earth shall awake, Some to everlasting life, Some to shame and everlasting contempt.
Daniel 12:7 (NKJV) Then I heard the man clothed in linen, who was above the waters of the river, when he held up his right hand and his left hand to heaven, and swore by Him who lives forever, that it shall be for a time, times, and half a time; and when the power of the holy people has been completely shattered, all these things shall be finished.
1 Thessalonians 4:15-18 (NKJV) For this we say to you by the word of the Lord, that we who are alive and remain until the coming of the Lord will by no means precede those who are asleep. 16 For the Lord Himself will descend from heaven (see Exodus 34:5) with a shout, with the voice of an archangel, and with the trumpet of God. And the dead in Christ will rise first (resurrection). 17 Then we who are alive and remain shall be caught up together with them in the clouds to meet the Lord in the air. And thus we shall always be with the Lord. 18 Therefore comfort one another with these words.
Luke 21:27-28 (NKJV) "Then they will see the Son of Man coming in a cloud with power and great glory. 28 "Now when these things begin to happen, look up and lift up your heads, because your redemption draws near."
Hebrews 9:24-28 (NKJV) For Christ has not entered the holy places made with hands, which are copies of the true, but into heaven itself, now to appear in the presence of God for us; 25 not that He should offer Himself often, as the high priest enters the Most Holy Place every year with blood of another; 26 He then would have had to suffer often since the foundation of the world; but now, once at the end of the ages, He has appeared to put away sin by the sacrifice of Himself. 27 And as it is appointed for men to die once, but after this the judgment, 28 so Christ was offered once to bear the sins of many. To those who eagerly wait for Him He will appear a second time, apart from sin, for salvation.
"Whosoever lives and believes in me will never die."
Rom 11:31 Even so have these also now not believed, that through your mercy they also may obtain mercy.