What, sir, not yet at rest? The king's a-bed. He hath been in unusual pleasure, and sent forth great largess to your offices.
At night, Banquo is still awake and talking with his son Fleance. He couldn't fall asleep, which can be interpreted as a foreshadow of the murder that will take place later on.
Is this a dagger which I see before me, The handle towards my hand? Come, let me clutch thee.
Banquo asked his son how the night was and Fleance started talking about the position of the moon. This is an anachronistic example because since they didn't have clocks, they were always out of time and obligated to watch the moon's position if they wanted to know the time.
I see thee yet, in form as palpable as which now I draw. Thou marshall'st me the way that I was going, and such an instrument I was to use.
Macbeth and Banquo are talking at night. Banquo wonders why Macbeth is not yet asleep and then informs him of all the presents the King has been giving out to everyone in the castle This is an example of a foreshadow because they portray the king as a very nice and kind person caring for others right before he is going to get killed.
Whiles I threat, he lives. Words to the heat of deeds too cold breath gives.
Macbeth encounters a floating dagger. He starts thinking it's just his imagination so he closes and opens his eyes to see if it disappeared but it didn't.
Macbeth keeps seeing the floating dagger so then he brings out his own. This moment for Macbeth was like a signal that indicated that he needed to go on with the plan and murder Duncan with the same instrument he intended to since the beginning.
Macbeth is talking to himself and he realizes that as he wastes time talking, Duncan is still alive. While he keeps talking he starts loosing the courage he needs to continue with his part of the evil plan.