Albert Barnes Commentary Matthew 24:16

"then let them that are in Judaea flee unto the mountains:" — Matthew 24:16 (ASV)

Then let them, etc. Then Christians may know that the end has 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 pursued. In all ages these caves were the favourite places of robbers; and 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.