לַ֤יְלָה וְיוֹמָם֙ לֹ֣א תִכְבֶּ֔ה לְעוֹלָ֖ם יַעֲלֶ֣ה עֲשָׁנָ֑הּ מִדּ֤וֹר לָדוֹר֙ תֶּחֱרָ֔ב לְנֵ֣צַח נְצָחִ֔ים אֵ֥ין עֹבֵ֖ר בָּֽהּ׃
Nacht und Tag verlischt es nicht, ewiglich steigt Rauch davon auf, von Geschlecht zu Geschlecht bleibt es wüst, in alle Ewigkeit zieht niemand hindurch.
Rashi on Isaiah
from generation to generation From that generation until the last generation. Another explanation is that this is Moses’ curse (Ex. 17:16): “The Lord has a war against Amalek from generation to generation.” From Moses’ generation to Saul’s generation, and from there to Mordecai’s generation, and from there to the generation of the King Messiah.
Ibn Ezra on Isaiah
It shall not be quenched. The fire thereof shall not be quenched.
Ibn Ezra on Isaiah
לנצח נצחים For ever and ever. For periods without end.