How could they see something that hadn't yet happened? Only God, or someone to whome He shows a vision of the future can see that.
This shows you have no looked at or considered any of the links.
Any reader can see you are not serious.
13 The burden of
Babylon, which Isaiah the son of Amoz did see.
2 Lift ye up a banner upon the high mountain, exalt the voice unto them, shake the hand, that they may go into the gates of the nobles.
3 I have commanded my sanctified ones, I have also called my mighty ones for mine anger, even them that rejoice in my highness.
4 The noise of a multitude in the mountains, like as of a great people; a tumultuous noise of the kingdoms of nations gathered together: the Lord of hosts mustereth the host of the battle.
5 They come from a far country, from the end of heaven, even the Lord, and the weapons of his indignation, to destroy the whole land.
6
Howl ye; for the day of the Lord is at hand; it shall come as a destruction from the Almighty.
7 Therefore shall all hands be faint, and every man's heart shall melt:
lk21:
Men's hearts failing them for fear,
8 And they shall be afraid: pangs and sorrows shall take hold of them; they shall be in pain as a woman that travaileth: they shall be amazed one at another; their faces shall be as flames.
9 Behold, the day of the Lord cometh, cruel both with wrath and fierce anger, to lay the land desolate: and he shall destroy the sinners thereof out of it.
10 For the stars of heaven and the constellations thereof shall not give their light: the sun shall be darkened in his going forth, and the moon shall not cause her light to shine.
LK21:
25 And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring;
26 Men's hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken.
11 And I will punish the world for their evil, and the wicked for their iniquity; and I will cause the arrogancy of the proud to cease, and will lay low the haughtiness of the terrible.
12 I will make a man more precious than fine gold; even a man than the golden wedge of Ophir.
13 Therefore I will shake the heavens, and the earth shall remove out of her place, in the wrath of the Lord of hosts, and in the day of his fierce anger.
14 And it shall be as the chased roe, and as a sheep that no man taketh up: they shall every man turn to his own people, and flee every one into his own land.
15 Every one that is found shall be thrust through; and every one that is joined unto them shall fall by the sword.
16 Their children also shall be dashed to pieces before their eyes; their houses shall be spoiled, and their wives ravished.
lk21
23 But woe unto them that are with child, and to them that give suck, in those days! for there shall be great distress in the land, and wrath upon this people.
24 And they shall fall by the edge of the sword, and shall be led away captive into all nations: and Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled.
17 Behold, I will stir up the Medes against them, which shall not regard silver; and as for gold, they shall not delight in it.
18 Their bows also shall dash the young men to pieces; and they shall have no pity on the fruit of the womb; their eyes shall not spare children.
19 And Babylon, the glory of kingdoms, the beauty of the Chaldees' excellency, shall be as when God overthrew Sodom and Gomorrah.
The same language in mT. 24, and here in Luke 21;
20 And when ye shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh.
21 Then let them which are in Judaea flee to the mountains; and let them which are in the midst of it depart out; and let not them that are in the countries enter thereinto.
22 For these be the days of vengeance, that all things which are written may be fulfilled.
23 But woe unto them that are with child, and to them that give suck, in those days! for there shall be great distress in the land, and wrath upon this people.
24 And they shall fall by the edge of the sword, and shall be led away captive into all nations: and Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled.
25 And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring;
26 Men's hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken.