Read it through once

LADY MACBETH. My hands are of your color, but I shame To wear a heart so white. [_Knocking within._] I hear knocking At the south entry:—retire we to our chamber. A little water clears us of this deed: How easy is it then! Your constancy Hath left you unattended.—[_Knocking within._] Hark, more knocking. Get on your nightgown, lest occasion call us And show us to be watchers. Be not lost So poorly in your thoughts.