Book XIII - Chapter III - How Sir Gawaine assayed to draw out the sword, and how an old man brought in Galahad.
NOW, fair nephew, said the king unto Sir Gawaine, assay ye, for my love. Sir, he said, save your good grace I shall not do that. Sir, said the king, assay to take the sword and at my commandment. Sir, said Gawaine, your commandment I will obey. And therewith he took up the sword by the handles, but he might not stir it. I thank you, said the king to Sir Gawaine. My lord Sir Gawaine, said Sir Launcelot, now wit ye well this sword shall touch you so sore that ye shall will ye had never set your hand thereto for the best castle of this realm. Sir, he said, I might not withsay mine uncle's will and commandment. But when the king heard this he repented it much, and said unto Sir Percivale that he should assay, for his love. And he said: Gladly, for to bear Sir Gawaine fellowship. And therewith he set his hand on the sword and drew it strongly, but he might not move it. Then were there none that durst be so hardy to set their hands thereto. Now may ye go to your dinner, said Sir Kay unto the king, for a marvellous adventure have ye seen. So the king and all went unto the court, and every knight knew his own place, and set him therein, and young men that were knights served them.
So when they were served, and all sieges fulfilled save only the Siege Perilous, anon there befell a marvellous adventure, that all the doors and windows of the palace shut by themself. Not for then the hall was not greatly darked; and therewith they were all abashed both one and other. Then King Arthur spake first and said: By God, fair fellows and lords, we have seen this day marvels, but or night I suppose we shall see greater marvels.
In the meanwhile came in a good old man, and an ancient, clothed all in white, and there was no knight knew from whence he came. And with him he brought a young knight, both on foot, in red arms, without sword or shield, save a scabbard hanging by his side. And these words he said: Peace be with you, fair lords. Then the old man said unto Arthur: Sir, I bring here a young knight, the which is of king's lineage, and of the kindred of Joseph of Aramathie, whereby the marvels of this court, and of strange realms, shall be fully accomplished.