'Heads' in the Bible

But upon their opposing him with abusive language, he shook his clothes by way of protest, and said to them, "Your ruin will be upon your own heads. I am not responsible: in future I will go among the Gentiles."

Associate with these men and purify yourself with them, and pay their expenses so that they can shave their heads. Then everybody will know that there is no truth in these stories about you, but that in your own actions you yourself scrupulously obey the Law.