Zedekah … did that which was evil in the sight of the LORD his God, and humbled not himself before Jeremiah the prophet speaking from the mouth of the LORD. And he also rebelled against king Nebuchadnezzar, who had made him swear by God: but he stiffened his neck, and hardened his heart from turning unto the LORD God of Israel. 2 Chronicles 36.11-13And everyone else in Judah was just as bad. They did all the basic heathen-like abominations, polluted the temple. You name it.
Moreover all the chief of the priests, and the people, transgressed very much after all the abominations of the heathen; and polluted the house of the LORD which he had hallowed in Jerusalem. 36.14They even ignored, mocked, and mistreated God’s messengers.
And the LORD God of their fathers sent to them by his messengers, rising up betimes, and sending; because he had compassion on his people, and on his dwelling place. But they mocked the messengers of God, and despised his words, and misused his prophets. 36.15-16aWell, there’s only so much of that shit that God will put up with. Finally he couldn’t take it any longer and unleashed his wrath upon them.
The wrath of the LORD arose against his people, till there was no remedy. 36.16bHe sent the Babylonians (Chaldees) to slaughter the people of Jerusalem. Young men, little girls, old people – God had them all killed without pity.
Therefore he brought upon them the king of the Chaldees, who slew their young men with the sword in the house of their sanctuary, and had no compassion upon young man or maiden, old man, or him that stooped for age: he gave them all into his hand. 36.17Well, not all, I guess. Some survived and were carried off to Babylon.
Jeremiah gets even more carried away with this story. Here's what he says.
Thus saith the LORD God of Israel; Behold, I will turn back the weapons of war that are in your hands, wherewith ye fight against the king of Babylon, and against the Chaldeans … And I myself will fight against you with an outstretched hand and with a strong arm, even in anger, and in fury, and in great wrath. ... I will deliver Zedekiah king of Judah, and his servants, and the people, and such as are left in this city from the pestilence, from the sword, and from the famine, into the hand of Nebuchadrezzar king of Babylon, and into the hand of their enemies, and into the hand of those that seek their life: and he shall smite them with the edge of the sword; he shall not spare them, neither have pity, nor have mercy. ... He that abideth in this city shall die by the sword, and by the famine, and by the pestilence: but he that goeth out, and falleth to the Chaldeans that besiege you, he shall live, and his life shall be unto him for a prey. For I have set my face against this city for evil, and not for good, saith the LORD: it shall be given into the hand of the king of Babylon, and he shall burn it with fire. Jeremiah 21:4-10The Bible doesn't say how many God killed with the sword, famine, and disease. But according to Jeremiah, everyone in Jerusalem died, except for those who surrendered to Nebachadnezzar. So I'll guess 10,000.