What does Macbeth refuse to do and why does he refuse to do it in Act 2 Scene 2?

Lady Macbeth soothes him and tells him to wash his hands, but notices he's still carrying the daggers he used to kill Duncan. Macbeth refuses to return to the scene of the crime. ... A knock sounds, terrifying Macbeth. He worries that not all the water in the world could wash the blood from his hands

Explanation:

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the international phonetic alphabet (a standardized system of phonetic symbols devised and maintained by the international phonetic association) is composed of one or more elements of two basic types, letters and diacritics.