Matthew 24:16

Let - To hinder or obstruct.

Then let them which be in Judea flee into the mountains - This counsel was remembered and wisely followed by the Christians afterwards. Eusebius and Epiphanius say, that at this juncture, after Cestius Gallus had raised the siege, and Vespasian was approaching with his army, all who believed in Christ left Jerusalem and fled to Pella, and other places beyond the river Jordan; and so they all marvellously escaped the general shipwreck of their country: not one of them perished. See on Matthew 24:13 (note).

Then let them ... - Then Christians may know that the end is come, and should seek a place of safety. Destruction would not only visit the "city," but would extend to the surrounding part of Judea.

The mountains - The mountains of Palestine abound in caves, a safe retreat for those who are pursued. In all ages these caves have been the favorite places of robbers, and they were also resorted to by those in danger, 1 Samuel 13:6; 1 Samuel 22:1; 2 Samuel 23:13; Joshua 10:16. In those mountains they would be safe.

24:16 Then let them who are in Judea flee to the mountains - So the Christians did, and were preserved. It is remarkable that after the Romans under Cestus Gallus made their first advances toward Jerusalem, they suddenly withdrew again, in a most unexpected and indeed impolitic manner. This the Christians took as a signal to retire, which they did, some to Pella, and others to Mount Libanus.