'Bars' in the Bible

Thus says the Lord to me, “Make for yourself bonds and yokes and put them on your neck,

Hananiah spoke in the presence of all the people, saying, “Thus says the Lord, ‘Even so within two full years I will break the yoke of Nebuchadnezzar king of Babylon from the neck of all the nations.’” Then the prophet Jeremiah went his way.

“Go and tell Hananiah, ‘The Lord says this, “You have broken yokes of wood, but you have made in their place bars of iron.”

“Arise [Nebuchadnezzar], go up against a nation which is at ease,Which lives securely,” says the Lord,“A nation which has neither gates nor bars;They dwell apart and alone.

The mighty warriors of Babylon have ceased to fight;They remain in their strongholds.Their strength and power have failed;They are becoming [weak and helpless] like women.Their dwelling places are set on fire;The bars on her gates are broken.