'Necks' in the Bible

Thus saith Jehovah of hosts, the God of Israel: Behold, I will bring upon this city and upon all her cities all the evil that I have spoken against it; for they have hardened their necks, not to hear my words.

And I spoke to Zedekiah king of Judah according to all these words, saying, bring your necks under the yoke of the king of Babylon, and serve him and his people, and live.