'Heads' in the Bible

And he made with him the agreement of which circumcision was the sign. And so Abraham had a son, Isaac, and gave him circumcision on the eighth day; and Isaac had a son, Jacob, and Jacob was the father of the twelve heads of the families of Israel.

And when they put themselves against him, and said evil words, he said, shaking his clothing, Your blood be on your heads, I am clean: from now I will go to the Gentiles.