Then came a voice in the hearing of them all, "Depart now, Sir Galahad, and go quickly to the maimed king, for he hath long abided to receive health from thy hand."
So the three knights departed, and Sir Percival's sister with them, and came to a vast forest, and saw before them a white hart, exceeding fair, led by four lions; and marveling greatly at that sight, they followed.
Anon they came to a hermitage and a chapel, whereunto the hart entered, and the lions with it. Then a priest offered mass, and presently they saw the hart change into the figure of a man, most sweet and comely to behold; and the four lions also changed and became a man, an eagle, a lion, and an ox. And suddenly all those five figures vanished without sound. Then the knights marveled greatly, and fell upon their knees, and when they rose they prayed the priest to tell them what that sight might mean.
"What saw ye, sirs?" said he, "for I saw nothing." Then they told him.
"Ah, lords!" said he, "ye are full welcome; now know I well ye be the knights who shall achieve the Sangreal, for unto them alone such mysteries are revealed. The hart ye saw is One above all men, white and without blemish, and the four lions with Him are the four evangelists."
When they heard that they heartily rejoiced, and thanking the priest, departed.
Anon, as they passed by a certain castle, an armed knight suddenly came after them, and cried out to the damsel, "By the holy cross, ye shall not go till ye have yielded to the custom of the castle."
"Let her go," said Sir Percival, "for a maiden, wheresoever she cometh, is free."
"Whatever maiden passeth here," replied the knight, "must give a dishful of her blood from her right arm."
"It is a foul and shameful custom," cried Sir Galahad and both his fellows, "and sooner will we die than let this maiden yield thereto."