What is the meaning of the quote "The Thane of Fife had a wife

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What is the meaning of the quote "The Thane of Fife had a wife.

  1. Where is she now?
  2. What, will these hands ne’er be clean? No more o’ that, my lord, no more o’ that.
  3. You mar all with this starting." said by Lady Macbeth?