What is the tone of Macbeth words in last line reading passage a guardian their bones?

Please provide the passage containing the line "a guardian their bones" so I can determine the tone of Macbeth's words.

Context is crucial for understanding tone. Without knowing the surrounding lines, I can only speculate on the possible tone, which could range from:

* Solemn and protective: If Macbeth is speaking about protecting the dead, the tone could be solemn and protective.

* Threatening: If Macbeth is speaking about guarding the bones of someone he has killed, the tone could be threatening.

* Sarcastic: If Macbeth is using the phrase ironically or mockingly, the tone could be sarcastic.

Please provide the full passage or more information so I can give you a more accurate assessment of the tone.