In "Macbeth", these 3 words immediately precede the line "and damn'd be him that first cries, 'Hold, enough!'"
Compare this with the prose scene which immediately precedes the 
climactic soliloquy .... marble' (Macbeth 111, iv, 21-2), but the line serves a very 
different purpose in ..... And damn'd be him that first cries 'Hold, enough! '