Hassan's Loyalty to Amir
One of the strongest examples of loyalty in The Kite Runner is seen in Hassan's unwavering loyalty to Amir as both his friend and servant. An early instance of Hassan's loyalty occurs on page 42, when Assef tries to punch Amir and Hassan stops him by pointing his slingshot at him. This is a strong example, because Hassan insults and threatens someone superior to him for the sake of Amir's safety, which ultimately leads Assef to targeting Hassan later on. Later on, on page 67 when Hassan runs Amir's kite for him and shouts "For you a thousand times over," his statement represents the endless number of times that Hassan remains loyal, no matter how poorly Amir treats him. One of the greatest acts of loyalty that Hassan commits occurs on page 107, when Hassan does not tell Baba that Amir framed him for stealing the watch and money. Amir himself envisions Hassan "pleading [Ali] not to give him away." All of these examples throughout the novel represent how strong and consistent Hassan's loyalty is.
Amir's Loyalty to Sohrab
Following the death of Hassan and the revelation that he and Amir were half-brothers, Amir redeems himself by showing loyalty towards Sohrab, Hassan's son. The first true moment of this loyalty is in Chapter 22, when Amir gets beaten up by Assef while trying to rescue Sohrab. Amir also shows loyalty to Sohrab on page 320 when he asks him, "Would you like to come live in America with me and my wife?" By taking Sohrab in as his own, Amir is also showing loyalty to Hassan. This is shown on the novel's final page, when Amir runs the kite for Sohrab, saying "For you, a thousand times over" just as Hassan had once said to him.