Why did you bring these daggers from the place? They must lie there. Go carry them, and smear the sleepy grooms with blood.
I'm afraid they have awaked and 'tis not done. The attempt and not the deed confounds us. Hark! I laid their daggers ready; he could not miss'em.
I'll go no more: I am afraid to think what I have done; look on't again I dare not.
Whence is that knocking? how is't with me, when every noice appeals me? What dads are here? ha, they pluck out mine eyes! Will all great Neptune's ocean wash this blood clean from my hand? No, this my hand will rather the multitudinous seas incarnadine, making the green one red
Macbeth just returns after killing King Duncan and finds Lady Macbeth. Lady Macbeth worries the deed of killing the king is not finished and people may have woke up.
My hands are of your color, but I shame to wear a heart so white.
Lady Macbeth realizes that the daggers are still in Macbeth's hand, even though he was clearly told to leave them in the chamber so no one will know that he killed the king.
I hear a knocking at the south entry. Retire we to our chamber. A little water clears us of this deed.
Macbeth begins to question what he did, he hears knocking and every noise begins to grab his attention as he thinks about what will happen to him if people find out.
To know my deed, 'twere best not know myself
Lady Macbeth does not appreciate how lazy Macbeth was about killing King Duncan. She essentially says that she isn't proud of being married to him because of how much he is a coward.
After Macbeth speaks about knocking Lady Macbeth begins to literally here knocking. She thinks this could be a distraction from the murder
Macbeth says that he doesn't really know himself anymore because of how he killed King Duncan.