WHO said: "why did you bring these daggers from the place?/ they must lie there: go carry them; and smear/ the sleepy grooms with blood." and WHAT does it means?

Lady Macbeth says this. She is angry that Macbeth brought the bloody daggers with him. Her plan was to have Macbeth smear the King's sleeping guards with blood and plant the daggers beside them to make them look guilty for killing Duncan.