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.