'Potsherd' in the Bible

And he taketh to him a potsherd to scrape himself with it, and he is sitting in the midst of the ashes.

Silver of dross spread over potsherd, Are burning lips and an evil heart.

And He hath broken it As the breaking of the potters' bottle, Beaten down -- He doth not spare, Nor is there found, in its beating down, A potsherd to take fire from the burning, And to draw out waters from a ditch.

Woe to him who is striving with his Former, (A potsherd with potsherds of the ground!) Doth clay say to its Framer, 'What dost thou?' And thy work, 'He hath no hands?'