Isaiah 30:17

17 One thousand [shall flee] at the threat of one; at the threat of five shall you flee: until you be left as a beacon on the top of a mountain, and as an ensign on 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 For thus said the Lord GOD, the Holy One of Yisra'el, In returning and rest shall you be saved; in quietness and in confidence shall be your strength. You would not:
16 but you said, No, for we will flee on horses; therefore shall you flee: and, We will ride on the swift; therefore shall those who pursue you be swift.
17 One thousand [shall flee] at the threat of one; at the threat of five shall you flee: until you be left as a beacon on the top of a mountain, and as an ensign on a hill.
18 Therefore will the LORD wait, that he may be gracious to you; and therefore will he be exalted, that he may have mercy on you: for the LORD is a God of justice; blessed are all those who wait for him.
19 For the people shall dwell in Tziyon at Yerushalayim; you shall weep no more; he will surely be gracious to you at the voice of your cry; when he shall hear, he will answer you.
The Hebrew Names Version is in the public domain.