Pentecostal Oath
The Pentecostal Oath is an oath which the Knights of King Arthur's Round Table swear in Sir Thomas Malory's Le Morte d'Arthur. It embodies the secular code of chivalry as envisioned by Malory, reconceptualizing the religious, Grail-centered themes of the Round Table from his source, the Post-Vulgate Suite du Merlin.
In William Caxton's printed edition, this appears at the end of book three, chapter fifteen. According to Malory's text :