'Fro' in the Bible

I looked at the mountains, and behold, they were trembling,And all the hills moved back and forth.

“Roam back and forth through the streets of Jerusalem,And look now and take note.And look in her open squaresTo see if you can find a man [as Abraham sought in Sodom],One who is just, who [has integrity and moral courage and] seeks truth (faithfulness);Then I will pardon Jerusalem—[for the sake of one uncompromisingly righteous person].

I will make them an object of horror to all nations of the earth because of Manasseh [the despicable] son of Hezekiah, king of Judah, for the [evil and detestable] things which he did in Jerusalem.

I will make them a focus of ridicule and disappointment [tossed back and forth] among all the kingdoms of the earth, a [notorious] disgrace, a byword, a taunt and a curse in all places where I will scatter them.

They will drink and stagger and go mad because of the sword that I will send among them.”

I will pursue them with the sword, with famine and with virulent disease; and I will make them a terror (warning) to all the kingdoms of the earth, to be a curse, a horror, a hissing, and a disgrace among all the nations to which I have driven them,

“Therefore says the Lord, ‘You have not obeyed Me; you have not proclaimed liberty to your brother and your countryman. Behold (listen very carefully), I am proclaiming liberty to you—[liberty to be put] to the sword, [liberty] to [be ravaged by] the virulent disease, and [liberty] to [be decimated by] famine,’ says the Lord; ‘and I will make you a horror and a warning to all the kingdoms of the earth.

“Wail, O Heshbon, for Ai [in Ammon] has been destroyed!Cry out, O daughters of Rabbah!Wrap yourselves with sackcloth and lament (cry out in grief),And rush back and forth inside the enclosures;For Malcam [your powerless god] will go into exileTogether with his priests and his princes.