Desolation Has Come Near - Luke 21:20-24

Luke 21:20-24 ESV 

Jesus Foretells Destruction of Jerusalem

 “But when you see Jerusalem surrounded by armies, then know that its desolation has come near. Then let those who are in Judea flee to the mountains, and let those who are inside the city depart, and let not those who are out in the country enter it, for these are days of vengeance, to fulfill all that is written. Alas for women who are pregnant and for those who are nursing infants in those days! For there will be great distress upon the earth and wrath against this people. They will fall by the edge of the sword and be led captive among all nations, and Jerusalem will be trampled underfoot by the Gentiles, until the times of the Gentiles are fulfilled.

This prophesy is against Jerusalem and Israel. The "days of vengeance" apply to "this people" primarily, and to Babylon secondarily. This is the judgement against a people chosen by God who rejected Him and blasphemed His dwelling place. 

Revelation represents this judgement and  conclusion from chapter four onward. The letters to the churches in chapters two and three pertain to the Church which is the outcome of Israel's failure and the fulfillment of God's will. 

The time is coming when Israel will come to the feet of Christ and witness to the nations.