'Hair' in the Bible

So Hanun took David's servants, and cutting off their hair and the skirts of their robes up to the middle, sent them away.

Then certain men went and gave David word of what had been done to them. And he sent out with the purpose of meeting them; for the men were greatly shamed. And the king said, Keep where you are at Jericho till your hair is long again, and then come back.