The Tales of Beedle the Bard was mentioned in Harry Potter and the Deathly Hallows. The introduction states that this version is a new translation by Hermione Granger from ancient runes.
There are five fairy tales in this book; The Wizard and the Hopping Pot, The Fountain of Fair Fortune, The Warlock's Hairy Heart, Babbitty Rabbitty and her Cackling Stump, and The Tale of the Three Brothers. Following each of the fairy tales are personal notes and analysis by Professor Dumbledore, the late headmaster of Hogwarts School.
These fairy tales are short and enchanting with morals that fit reasonably well into the universe of both Magic and Muggle.
Dumbledore's notes, however, are truly what makes this a unique and special treasure for those that are Potter fans. The witticisms by Dumbledore show his warmth and mischievous humor all the while seeing into the spirit of the wizard Harry Potter fans love and revere. The Tales of Beedle the Bard are a very welcome addition to any Potter collection.