'Head' in the Bible

(Now this man, with the reward of his evil-doing, got for himself a field, and falling head first, came to a sudden and violent end there.

And they said to her, You are off your head. But still she said, with decision, that it was so. And they said, It is his angel.

And when he made his answer in these words, Festus said in a loud voice, Paul, you are off your head; your great learning has made you unbalanced.

Then Paul said, I am not off my head, most noble Festus, but my words are true and wise.

So I make request to you to take food; for this is for your salvation: not a hair from the head of any of you will come to destruction.