'Hairs' in the Bible

For evils without number have encompassed me. My iniquities have overtaken me, so that I am not able to see. They are more than the hairs of my head, and my heart fails me.

More numerous than the hairs of my head are [those] hating me without a cause. [Those who are] destroying me--my enemies wrongfully-- are mighty. What I did not steal, I then must restore.