Jeremiah 10:17 - Matthew Poole's English Annotations on the Holy Bible

The prophet now enters upon another subject, and probably begins another sermon. Gather up thy wares, i.e. every thing thou hast any advantage by, not only thy domestic concerns, but all thy traffic and merchandise, wherever thou hast any concerns in the land, as men use to do in case of invasion by an enemy, to secure them. It seems to be a sarcasm, or kind of military derision. O inhabitant of the fortress: this is understood by some as spoken to the Babylonians, that they should make provision for their escape, their idols being not able to save them; but this seems to be remote from the prophet's meaning. It is rather therefore directed to the inhabitants of Jerusalem, that being the chief place of security in Judea, and by a synecdoche to all other places that they promised themselves security in; the approaching destruction being to pass through the whole country.