Luke 21:20 says, “When you see Jerusalem surrounded by armies, then know that its desolation has come near”. This verse is part of a passage that describes the destruction of Jerusalem and the coming of the Son of Man. 

Explanation

• This verse is a sign that the destruction of Jerusalem is near. 
• It also indicates that the days of vengeance have begun, and that this is a fulfillment of what is written. 
• The verse tells people to flee to the mountains if they are in Judea, to leave the city if they are inside, and not to enter it if they are in the country. 
• The passage also describes signs in the sun, moon, and stars, as well as distress of nations, roaring of the sea, and men's hearts failing from fear. 
• The passage also says that when these things begin to happen, people should look up and lift up their heads, because their redemption draws near.