[He speaks each line one at a time, allowing them to respond.]

"I swear to defend the Knighthood."

"I swear that I shall protect all weaknesses and shall constitute myself the defender of them."

"I shall not recoil before mine Enemy."

"I shall make war against injustice, without cessation and without mercy."

"I shall never lie, and shall remain faithful to my pledged word."

"I shall be generous, and listen to and respect all."

[And finally, with his most reverent tone:]

"I shall be everywhere and always the champion of the right and the good against injustice and evil."

[optional rolling; roll a D20 Wisdom check in order to see if your Knight can remember the phrases properly or not so much.