Firstly, in the second scene, Macbeth is trying to wash off the blood from his hands after murdering King Duncan.

Secondly, in the third scene, Macbeth talks about Duncan's death.

Macbeth describes King Duncan in a very noble manner; “silver laced skin”, “golden blood.” He refers to his royalty and his status as a king, minimizing his own chances of being a suspect of his murderer. His words like “gash`d, stabs” display the extravagant bloodshed involved in the murder. Thus, blood as a symbol shows the horrific nature of the murder and represents it as a cannibalistic execution.

And his gash`d stabs look`d like a breach

He describes King Duncan's murder as “more than a bloody deed,” implying that his murder was an evil act. He refers to it as being unjust and gruel. These words distinguish his murder from just any other death. The reference of blood itself

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