Macbeth has just arrived back at his castle and has told lady Macbeth that the king will be coming over tomorrow
To-morrow as he purposes
And when goes hence
That which hath made them drunk hath made me bold, What hath quench’d them hath given me fire. Hark! Peace! It was the owl that shriek’d, the fatal bellman, Which gives the stern’st good-night. He is about it: The doors are open, and the surfeited grooms That death and nature do contend about them, Whether they live or die.
Act 2 Scene 2
Alack! I am afraid they have awak’d, And ’tis not done; the attempt and not the deed Confounds us. Hark! I laid their daggers ready; He could not miss them. Had he not resembled My father as he slept I had done ’t. My husband!
I heard the owl scream and the crickets cry
I have done the deed. Didst thou not hear a noise?