'Hair' in the Bible

Then she said, “Please let the king remember the Lord your God, so that the avenger of blood will not continue to destroy, otherwise they will destroy my son.” And David said, “As the Lord lives, not a single hair [from the head] of your son shall fall to the ground.”

When he cut the hair of his head (for at the end of each year he cut it, because its weight was heavy on him) he weighed the hair of his head at 200 shekels by the king’s weight.