Luke 21 is only dealing with the end times from verses 8-11 and picks it up again in verse 25. Verses 12-24 deal with what happened in 70ad - BEFORE the times of the end. By watching and heeding Jesus' warning there were no Christians harmed during the destruction of Jerusalem. When they saw Jerusalem surrounded they fled. I know that the language is similar to Matthew 24, but it's not the same. Matthew says AFTER this, Luke says BEFORE this. One word makes all the difference! :)Luke 21:5Some of his disciples were remarking about how the temple was adorned with beautiful stones and with gifts dedicated to God. But Jesus said, 6“As for what you see here, the time will come when not one stone will be left on another; every one of them will be thrown down.”
7“Teacher,” they asked, “when will these things happen? And what will be the sign that they are about to take place?”
8He replied: “Watch out that you are not deceived. For many will come in my name, claiming, ‘I am he,’ and, ‘The time is near.’ Do not follow them. 9When you hear of wars and revolutions, do not be frightened. These things must happen first, but the end will not come right away.”
10Then he said to them: “Nation will rise against nation, and kingdom against kingdom. 11There will be great earthquakes, famines and pestilences in various places, and fearful events and great signs from heaven.
12“But before all this, they will lay hands on you and persecute you. They will deliver you to synagogues and prisons, and you will be brought before kings and governors, and all on account of my name. 13This will result in your being witnesses to them. 14But make up your mind not to worry beforehand how you will defend yourselves. 15For I will give you words and wisdom that none of your adversaries will be able to resist or contradict. 16You will be betrayed even by parents, brothers, relatives and friends, and they will put some of you to death. 17All men will hate you because of me. 18But not a hair of your head will perish. 19By standing firm you will gain life.
20“When you see Jerusalem being surrounded by armies, you will know that its desolation is near. 21Then let those who are in Judea flee to the mountains, let those in the city get out, and let those in the country not enter the city. 22For this is the time of punishment in fulfillment of all that has been written. 23How dreadful it will be in those days for pregnant women and nursing mothers! There will be great distress in the land and wrath against this people. 24They will fall by the sword and will be taken as prisoners to all the nations. Jerusalem will be trampled on by the Gentiles until the times of the Gentiles are fulfilled.
25“There will be signs in the sun, moon and stars. On the earth, nations will be in anguish and perplexity at the roaring and tossing of the sea. 26Men will faint from terror, apprehensive of what is coming on the world, for the heavenly bodies will be shaken. 27At that time they will see the Son of Man coming in a cloud with power and great glory. 28When these things begin to take place, stand up and lift up your heads, because your redemption is drawing near.”
29He told them this parable: “Look at the fig tree and all the trees. 30When they sprout leaves, you can see for yourselves and know that summer is near. 31Even so, when you see these things happening, you know that the kingdom of God is near.
32“I tell you the truth, this generationb will certainly not pass away until all these things have happened. 33Heaven and earth will pass away, but my words will never pass away.
34“Be careful, or your hearts will be weighed down with dissipation, drunkenness and the anxieties of life, and that day will close on you unexpectedly like a trap. 35For it will come upon all those who live on the face of the whole earth. 36Be always on the watch, and pray that you may be able to escape all that is about to happen, and that you may be able to stand before the Son of Man.”
Now for Matthew by comparison:
3As Jesus was sitting on the Mount of Olives, the disciples came to him privately. “Tell us,” they said, “when will this happen, and what will be the sign of your coming and of the end of the age?”
4Jesus answered: “Watch out that no one deceives you. 5For many will come in my name, claiming, ‘I am the Christ,a’ and will deceive many. 6You will hear of wars and rumors of wars, but see to it that you are not alarmed. Such things must happen, but the end is still to come. 7Nation will rise against nation, and kingdom against kingdom. There will be famines and earthquakes in various places. 8All these are the beginning of birth pains.
9“Then you will be handed over to be persecuted and put to death, and you will be hated by all nations because of me. 10At that time many will turn away from the faith and will betray and hate each other, 11and many false prophets will appear and deceive many people. 12Because of the increase of wickedness, the love of most will grow cold, 13but he who stands firm to the end will be saved. 14And this gospel of the kingdom will be preached in the whole world as a testimony to all nations, and then the end will come.
15“So when you see standing in the holy place ‘the abomination that causes desolation,’b spoken of through the prophet Daniel—let the reader understand— 16then let those who are in Judea flee to the mountains. 17Let no one on the roof of his house go down to take anything out of the house. 18Let no one in the field go back to get his cloak. 19How dreadful it will be in those days for pregnant women and nursing mothers! 20Pray that your flight will not take place in winter or on the Sabbath. 21For then there will be great distress, unequaled from the beginning of the world until now—and never to be equaled again. 22If those days had not been cut short, no one would survive, but for the sake of the elect those days will be shortened. 23At that time if anyone says to you, ‘Look, here is the Christ!’ or, ‘There he is!’ do not believe it. 24For false Christs and false prophets will appear and perform great signs and miracles to deceive even the elect—if that were possible. 25See, I have told you ahead of time.
26“So if anyone tells you, ‘There he is, out in the desert,’ do not go out; or, ‘Here he is, in the inner rooms,’ do not believe it. 27For as lightning that comes from the east is visible even in the west, so will be the coming of the Son of Man. 28Wherever there is a carcass, there the vultures will gather.
29“Immediately after the distress of those days
“‘the sun will be darkened,
and the moon will not give its light;
the stars will fall from the sky,
and the heavenly bodies will be shaken.’c
30“At that time the sign of the Son of Man will appear in the sky, and all the nations of the earth will mourn. They will see the Son of Man coming on the clouds of the sky, with power and great glory. 31And he will send his angels with a loud trumpet call, and they will gather his elect from the four winds, from one end of the heavens to the other. (Not the rapture, the in gathering at the physical second coming of Christ.)
32“Now learn this lesson from the fig tree: As soon as its twigs get tender and its leaves come out, you know that summer is near. 33Even so, when you see all these things, you know that itd is near, right at the door. 34I tell you the truth, this generatione will certainly not pass away until all these things have happened. 35Heaven and earth will pass away, but my words will never pass away.36“No one knows about that day or hour (what day or hour? Not talking rapture here, talking heaven and earth passing away), not even the angels in heaven, nor the Son,f but only the Father. 37As it was in the days of Noah, so it will be at the coming of the Son of Man. 38For in the days before the flood, people were eating and drinking, marrying and giving in marriage, up to the day Noah entered the ark; 39and they knew nothing about what would happen until the flood came and took them all away. That is how it will be at the coming of the Son of Man. 40Two men will be in the field; one will be taken and the other left. 41Two women will be grinding with a hand mill; one will be taken and the other left.
42“Therefore keep watch, because you do not know on what day your Lord will come. 43But understand this: If the owner of the house had known at what time of night the thief was coming, he would have kept watch and would not have let his house be broken into. 44So you also must be ready, because the Son of Man will come at an hour when you do not expect him.
45“Who then is the faithful and wise servant, whom the master has put in charge of the servants in his household to give them their food at the proper time? 46It will be good for that servant whose master finds him doing so when he returns. 47I tell you the truth, he will put him in charge of all his possessions. 48But suppose that servant is wicked and says to himself, ‘My master is staying away a long time,’ 49and he then begins to beat his fellow servants and to eat and drink with drunkards. 50The master of that servant will come on a day when he does not expect him and at an hour he is not aware of. 51He will cut him to pieces and assign him a place with the hypocrites, where there will be weeping and gnashing of teeth.
Anyway, you see the difference, I'm sure. God bless!