Thy substance - will I give to the spoil without price - Invaluable property shall be given up to thy adversaries. Or, without price - thou shalt have nothing for it in return.
Jeremiah is personally addressed in the verse, because he stood before God as the intercessor, representing the people.
(1) God would give Judah‘s treasures away for nothing; implying that He did not value them.
(2) the cause of this contempt is Judah‘s sins.
(3) this is justified by Judah having committed them throughout her whole land.