"Before my God, I might not this believe without the sensible and true avouch of my own eyes."
"I shall in my best obey you."
"...we beseech you, bend you to remain here in the cheer and comfort of our eye..."
"My lord, I think I saw father last night."
"For God's love let me hear!"
The three sentinels, Horatio, Marcellus and Bernardo witness old King Hamlet's ghost in the watch tower and decide to tell the king what they've seen.
"Angels and ministers of grace defend us!"
In the castle, new king Claudius and his wife, Gertrude, beg Hamlet to stay in Denmark. He agrees to.
"A murder most foul, as in the best it is, but this most foul, strange and unimaginable."
The three sentinels run into Hamlet on the way and tell him in secret what they've seen. Hamlet decides to join their next watch.
"Revenge his foul and most unnatural murder."
The ghost appears again, this time beckoning Hamlet to an excluded area, to talk alone. Hamlet agrees, though the sentinels believe they should follow.
The ghost reveals to Hamlet that he's been murdered by the new king and asks for his son to avenge him.
Hamlet agrees to avenge him and swears to keep this information to himself. He returns to the guards and swears them to secrecy without telling them anything.