First three books

Rubeus Hagrid is introduced in the opening chapter of Harry Potter and the Philosopher's Stone. Following the death of James and Lily Potter, Dumbledore entrusts Hagrid with rescuing the infant Harry from his parents' house after their murder by Lord Voldemort. When Minerva McGonagall expresses her concern about the fact that it was Hagrid who would carry Harry to the Dursleys', Dumbledore says that he would trust Rubeus Hagrid with his life, a fact that is demonstrated several times during the series when Dumbledore frequently asks him to carry out secret tasks. Years later, he is tasked to bring the Philosopher's Stone from Gringotts to Hogwarts, and assigned the three-headed dog Fluffy to take care of it. Dumbledore also gives him the task of locating Harry, helping him to find his bearings in the wizarding world and to buy his school things. Hagrid is the first member of the Hogwarts staff to be introduced to Harry before he began attending the school. Hagrid later becomes friends with Ron and Hermione as well. Later in the book,Rubeus Hagrid a hooded person (Professor Quirrell in disguise) gives him a dragon egg to elicit details about Fluffy. Rubeus Hagrid lets slip to Harry, Ron, and Hermione that the way to get past Fluffy is to play music,Rubeus Hagrid for which they use the flute Hagrid himself carved for Harry, which allows them to pursue the potential thief. The three also assist Hagrid after the dragon egg hatches, by helping to remove the baby dragon Norbert, who is taken to live in a dragon sanctuary in Romania where Ron's older brother, Charlie Weasley, works.

Rubeus Hagrid Readers first discover why Hagrid was expelled from Hogwarts in Harry Potter and the Chamber of Secrets. It is revealed that Hagrid was a student at Hogwarts at the same time as Tom Marvolo Riddle, the wizard that later became Voldemort. Hagrid was expelled during his third year, after being caught in possession of Aragog, a dangerous acromantula: this already grave crime was worsened due to the belief that it was "The Monster of Slytherin," and that Hagrid had released it from the Chamber of Secrets and,Rubeus Hagrid either intentionally or unintentionally, allowed it to attack and petrify (and in one case, kill) other students. This inaccurate belief was encouraged by Tom Riddle, the actual criminal, who had been using the true monster (a basilisk) to attack students, and who had framed Hagrid to avoid the school being closed. During the events of the book, the Basilisk is unleashed once again and Hagrid is sent to Azkaban prison, as he is believed again to be the responsible for the attacks. However, before being arrested, Hagrid tells Harry and Ron to "follow the spiders",Rubeus Hagrid so that they can meet Aragog and discover the identity of the true monster. After Harry defeats the Basilisk, it is revealed that Ginny Weasley is acting under the influence of Tom Riddle's diary, thus Hagrid is freed from prison.

Following the resignation of Silvanus Kettleburn, the former Care of Magical Creatures professor, Hagrid is assigned to teach the subject in Harry Potter and the Prisoner of Azkaban.Rubeus Hagrid He is also allowed to perform magic again since his name is cleared after the events of the previous book. During his first class, in which he introduces the hippogriffs to third-years, one of the beasts, Buckbeak, attacks Draco Malfoy after the boy insults it. Although Dumbledore manages to prove that Hagrid is innocent, the Ministry of Magic sentences Buckbeak to death. Thus, Hagrid's classes become extremely boring, and Harry, Ron, and Hermione spend some time in getting information that would help Hagrid in Buckbeak's defence. Towards the end of the book, in a plot twist, Hermione uses her Timeturner and, along with Harry, saves both Buckbeak and Sirius Black from unjust fates. Rubeus Hagrid