ירמיהו, פרק כ״ט, פסוק ל״ב

A severe judgment falls upon Shemaiah the Nehelamite and his descendants as a direct result of his false prophecies. The root of this harsh decree lies in his deceit; he spoke words of deviation, attributing messages to God that He never actually spoke [מצודת דוד]. Because of this profound betrayal, God remembers the sin specifically to bring about strict punishment and exact retribution.

The judgment against Shemaiah manifests in a devastating curse upon his family line, ensuring that he will have no descendant established among the community. There are two ways to understand the nature of this removal. It can be viewed as a complete loss of leadership and status, meaning that no descendant of his will ever sit in the councils of the leaders and elders [מצודת דוד]. Alternatively, the punishment is understood in a more existential sense, meaning that he will simply have no offspring who manage to settle permanently among the people in Babylon [ביאור שטיינזלץ].

Furthermore, the curse ensures that neither Shemaiah nor his descendants will witness the future good destined for the nation. The commentators agree that this promised good refers to the survival of the people and the ultimate privilege of returning from exile. Because of his false words, Shemaiah's family line is entirely cut off from living to see this great redemption.