Which tale involves a moral lesson about the importance of keeping promises and honoring oaths?

The Franklin's Tale explores the theme of keeping promises through the story of Arveragus, Dorigen, and Aurelius. Arveragus, a knight, makes a rash promise to his wife, Dorigen, that she can have an affair if she can make the rocks disappear from the coast. When Aurelius, a squire in love with Dorigen, magically fulfills this condition, Arveragus insists that Dorigen honor her promise, even though it causes him great pain. This tale highlights the complexities of love, honor, and the importance of upholding one's word, even in difficult circumstances.