Thou canst not say I did it. Never shake

Thy gory locks at me.

This quote is when Macbeth as lost his mind and is currently talking to the ghost of Banquo the man he had killed

Prithee, see there! Behold! Look! Lo! How say you?

Why, what care I?

Macbeth is trying to show lady Macbeth Banquo’s ghost