RobH_en_tn/2ki/19/25.md

General Information:

This continues the message from Yahweh, given by Isaiah, the prophet, for King Hezekiah concerning King Sennecherib. It uses parallelism throughout. (See: rc://en/ta/man/translate/figs-parallelism)

Have you not heard how ... times?

To make the point strongly this question assumes the listener knows the answer. Alternate translation: "Surely you know how ... times." (See: rc://en/ta/man/translate/figs-rquestion)

impregnable cities

"cities that cannot be captured" or "cities surrounded by high walls"