'Caldron' in the Bible

Which say, It is not near; let us build houses: this city is the caldron, and we be the flesh.

Therefore thus saith the Lord GOD; Your slain whom ye have laid in the midst of it, they are the flesh, and this city is the caldron: but I will bring you forth out of the midst of it.

This city shall not be your caldron, neither shall ye be the flesh in the midst thereof; but I will judge you in the border of Israel:

And utter a parable unto the rebellious house, and say unto them, Thus saith the Lord Jehovah, Set on the caldron, set it on, and also pour water into it:

Take the choice of the flock, and also a pile of wood for the bones under the caldron ; make it boil well; yea, let the bones thereof be boiled in the midst of it.

Wherefore thus saith the Lord Jehovah: Woe to the bloody city, to the caldron whose rust is therein, and whose rust is not gone out of it! take out of it piece after piece; No lot is fallen upon it.