C. F. Keil and Franz Delitzsch on Jeremiah 29:30-32

Jer 29:30-32

In consequence of this, Jeremiah received from the Lord the commission to predict to Shemaiah his punishment at the hand of God, and to send the prediction to all that are in Babylon in banishment. With Jer 29:31, cf. Jer 28:15. The punishment is this: Shemaiah shall have no posterity among his people, i.e., of his children none shall be left amongst the people, nor shall he see, i.e., experience, have any share in the blessings which the Lord will yet bestow upon His people. The extinction of his race and his own exclusion from the privilege of seeing the day of Israel’s redemption are the punishment that is to fall on him for his rebellion against the commandment of the Lord. With 'כּי סרה cf. Jer 28:16.