Isaiah 30:17

17 A thousand of you will run away when you see one enemy soldier, and five soldiers will be enough to make you all run away. Nothing will be left of your army except a lonely flagpole on the top of a hill.

Isaiah 30:17 Meaning and Commentary

Isaiah 30:17

One thousand [shall flee] at the rebuke of one
A troop of horse, consisting of a thousand men, shall flee upon the attack and onset of a single person, so dispirited should they be, and so possessed of the fear of the enemy; what was promised to them with respect to their enemies is here turned against them, ( Leviticus 26:7 Leviticus 26:8 ) ( Deuteronomy 32:30 ) : at the rebuke of five shall ye flee;
being attacked by a very small number, the whole army should run away: this denotes with what ease they should be routed, and put to flight; and is to be understood, not of what would be at the present time, but of what should come to pass hereafter, when the Chaldean army should come against them; till ye be left as a beacon upon the top of a mountain;
or, "as the mast of a ship", so the Septuagint and other versions. Jarchi says it signifies a high tree, or tall piece of wood fixed in the earth, like a ship's mast F16, set up to give warning of an enemy's approach, and when, and where, sometimes fires used to be kindled; hence the Targum is,

``till ye are left as a burning torch on the top of a mountain.''
The Syriac version renders it, "as a wild ass", solitary and alone: and as an ensign on a hill;
erected as a trophy of victory. The design of the metaphors is to show that there should be few that should escape falling into the enemy's hand, here and there one, that should he scattered about, and be very thin, as beacons and signs are, and should be warnings to others of pursuing the same foolish and sinful methods and practices.
FOOTNOTES:

F16 So Ben Melech says, it is a high piece of wood in a ship, on which they hang an ensign or flag; and so he interprets the ensign in the next clause of a veil, so called, because they lift it up upon the mast.

Isaiah 30:17 In-Context

15 The Sovereign Lord, the Holy One of Israel, says to the people, "Come back and quietly trust in me. Then you will be strong and secure." But you refuse to do it.
16 Instead, you plan to escape from your enemies by riding fast horses. And you are right - escape is what you will have to do! You think your horses are fast enough, but those who pursue you will be faster!
17 A thousand of you will run away when you see one enemy soldier, and five soldiers will be enough to make you all run away. Nothing will be left of your army except a lonely flagpole on the top of a hill.
18 And yet the Lord is waiting to be merciful to you. He is ready to take pity on you because he always does what is right. Happy are those who put their trust in the Lord.
19 You people who live in Jerusalem will not weep any more. The Lord is compassionate, and when you cry to him for help, he will answer you.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.