Charles Ellicott Commentary Jeremiah 34:17

"Therefore thus saith Jehovah: ye have not hearkened unto me, to proclaim liberty, every man to his brother, and every man to his neighbor: behold, I proclaim unto you a liberty, saith Jehovah, to the sword, to the pestilence, and to the famine; and I will make you to be tossed to and fro among all the kingdoms of the earth." — Jeremiah 34:17 (ASV)

Behold, I proclaim a liberty for you ... The phrase proclaim liberty, prominent in connection with the law that had been broken (Leviticus 25:10; Isaiah 61:1), is emphasized with an indignant irony.

They had refused to act as the servants of Jehovah (Leviticus 25:55) under His protection, finding in that service their perfect freedom.

And He, therefore, in His righteous wrath, would punish them by giving them the emancipation that they denied to others. He would set them free from His service, and therefore from His protection, and leave them to their fate—to the sword, to the famine, to exile.

They had refused the obedience that was freedom: they should have the freedom that would be bondage.