Total and irreversible destruction is captured through the vivid image of a shattered clay vessel. This imagery builds upon the concept of a towering protective wall suddenly collapsing, illustrating how the false security the people relied upon will be broken beyond repair. God Himself is the one who will break down the wall that the people placed their trust in [רד״ק, שד״ל]. The breaking is compared to the violent shattering of a potter's jug or a clay vessel used for holding wine [רש״י, מצודת ציון, ביאור שטיינזלץ]. Even though an actual wall is made of stone rather than clay, the image of fragile pottery is used to emphasize the sudden and absolute nature of the crash [שד״ל].
The vessel will be smashed into countless tiny pieces. During this destruction, God will show no pity, ensuring the object is completely obliterated [רד״ק, אבן עזרא, שד״ל]. A practical perspective notes that a potter naturally has no pity on a broken clay pot; rather, it is useful to crush it further into fine dust so it can be mixed with lime to create plaster [מצודת דוד]. As a result of this merciless crushing, not even a single large shard will survive among the ruins to be used for any practical purpose [רש״י, מצודת דוד, ביאור שטיינזלץ].
In the ancient world, even broken fragments of clay had value and were used for basic daily chores. However, the coming destruction will be so thorough that the resulting dust will be useless for even the simplest tasks. Ordinarily, a person might use a surviving piece of pottery to rake glowing coals from a fire hearth [רוב הפרשנים]. Similarly, a curved piece of clay was the perfect tool to scoop water from a shallow depression or puddle in the ground [רש״י, רד״ק, שד״ל]. A regular jug could not draw water from such a shallow spot, so a person would press a clay shard flat against the earth to collect whatever little moisture remained [רד״ק]. The act of scooping this water ultimately leaves the dirt floor completely bare and exposed [רד״ק, שד״ל, אבן עזרא]. Yet, not even a piece large enough for these humble tasks will be left behind.
This complete reduction to dust delivers a sharp message about the consequences of wrongdoing. The protective wall built by the people, which was founded on oppression and sin, is destined to crumble to nothing [מלבי״ם]. The powerful imagery serves as a warning that even if a sin appears minor to a person, it carries the potential to bring about complete, irreversible ruin [מצודת דוד].