Luke 21:20

20 “When you see Jerusalem being surrounded by armies, you will know that its desolation is near.

Read Luke 21:20 Using Other Translations

And when ye shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh.
"But when you see Jerusalem surrounded by armies, then know that its desolation has come near.
“And when you see Jerusalem surrounded by armies, then you will know that the time of its destruction has arrived.

What does Luke 21:20 mean?

John Gill's Exposition of the Bible
Luke 21:20

And when ye shall see Jerusalem compassed with armies
The Vulgate Latin, Syriac, and Persic versions read, "with an army"; that is, with the Roman army, as it was by the army which Titus Vespasian brought against it, and besieged it with:

then know that the desolation thereof is nigh;
signifying, that there would be no deliverance to be expected, as when the Assyrian army under Rabshakeh appeared against it; but that whenever the Roman army besieged it, its destruction might be looked upon as inevitable; nor was the siege raised until it was destroyed, which was about four years after.

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