ישעיהו, פרק מ״א, פסוק ט״ו

The Israelites, once perceived as fragile and helpless as a delicate worm, are promised a dramatic transformation. God assures them that they will become a formidable, destructive force capable of overcoming the enemies that rise against them. This sharp shift from a state of weakness to one of crushing power symbolizes their ultimate victory and dominance over the nations of the world, particularly as they emerge from exile [רד״ק, שד״ל, שטיינזלץ].

The imagery used is that of a heavy agricultural threshing sledge. The primary approach among commentators is that this refers to a long, thick wooden board embedded with iron spikes or sharp stones on its underside, which is dragged over grain stalks to cut them and separate the waste [רש״י, מצודת ציון, שד״ל]. Alternatively, the imagery might refer to two distinct implements, or simply serve to highlight the tool's exceptional cutting ability [רד״ק].

This threshing instrument is notably new, meaning its blades and grooves have not been dulled by time, allowing it to cut with perfect precision [רש״י]. On a conceptual level, this freshness suggests that the Israelites will conquer their enemies by virtue of new merits they acquire, rather than relying solely on old, exhausted merits from the past [מלבי״ם]. Furthermore, the tool is covered in countless sharp points and cutting edges. This multitude of teeth represents the vast spiritual strength the Israelites draw from fulfilling the commandments [מלבי״ם].

The action of threshing and crushing represents grinding the grain down finely and completely removing the waste [מלבי״ם, מצודת ציון]. The massive mountains and hills being threshed are a metaphor for powerful nations, along with their kings and leaders [רש״י, רד״ק, צאינה וראינה]. While some view this as a specific prediction regarding the collapse of the Babylonian Empire [אבן עזרא], the central approach understands it as a broader metaphor for all adversaries. These mighty empires, which appear as permanent and unmovable as mountains, will be crushed by the Israelites until they are reduced to chaff, the light and worthless dust of the harvest that simply scatters in the wind [מצודת ציון].