The Green Knight arrives to the castle and asks one of the knights to play a game with him.
"Sir, you are welcome in this place; I am the head of this court. They call me Arthur. Get down from your horse. I beg you, and join us for dinner, and then whatever you seek we will gladly see to."
"All I ask of this court is a Christmas game."
"'No, so help me God on high, my errand is hardly to sit at my ease in your castle.'"
"I shall let him have as my present this lovely gisarme, this ax, as heavy as he’ll need, to handle as he likes, and I will abide the first blow, bare-necked as I sit."
The Green Knight wants to play a game where the take swings at each other's necks, and Gawain tells Arthur that he will do it.
“I beseech you, Sire,” he said, “Let this game be mine."
"He said, “By heaven, sir, your request is strange; but since you have come here for folly, you may as well find it."
And the, swiftly, he slashed at the naked neck; the sharp of the battleblade shattered asunder the bones and sank through the shining fat and slit it in two..
“Let the King step down and give Sir Gawain the game!”
He held his head in his hand up high before him
“Look that you go, Sir Gawain, as good as your word, and seek till you find me, as loyally, my friend, as you’ve sworn in this hall to do, in the hearing of the knights.
As the end of the year approaches, Gawain leaves on his quest to find the Green Chapel and fulfill his pledge. After riding through wild country and encountering many dangers, he comes upon a splendid castle. The lord of the castle welcomes Gawain and invites him to stay with him and his lady for a few days.
“My lady gay, I can hardly take gifts at the moment; having nothing to give, I’d be wrong to take gifts in turn.”
He raises that ax up lightly and flashes it down, and that blinding bit bites in at the knight’s bare neck— but hard as he hammered it down, it hurt him no more than to nick the nape of his neck, so it split the skin
"You kissed my pretty wife twice and returned me the kisses; and so for the first two days, mere feints, nothing more severe. A man who’s true to his word, there’s nothing he needs to fear; you failed me, though, on the third exchange, so I’ve tapped you here."