'Hair' in the Bible

Then she said, "Please let the king remember Yahweh your God, that the avenger of blood destroy not any more, lest they destroy my son." He said, "As Yahweh lives, not one hair of your son shall fall to the earth."

When he cut the hair of his head (now it was at every year's end that he cut it; because it was heavy on him, therefore he cut it); he weighed the hair of his head at two hundred shekels, after the king's weight.