Luke 21:19 Meaning

17And ye shall be hated of all men for my name's sake.

18But there shall not an hair of your head perish.

19In your patience possess ye your souls.

20And when ye shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh.

21Then let them which are in Judaea flee to the mountains; and let them which are in the midst of it depart out; and let not them that are in the countries enter thereinto.