In the story, John Byro is the owner of the horse that Mourad and Aram have stolen. One day, as the boys are making their way to a deserted vineyard, they come across John Byro.
After saying good morning, John Byro studies the horse for some time, then he asks what is the horse's name. Mourad tells him the name before Byro comments that this horse looks exactly like his missing horse. He then asks if he can look inside the horse's mouth to inspect its teeth.
After looking at the teeth, he says,
"'Tooth for tooth,' he said. 'I would swear it is my horse if I didn't know your parents. The fame of your family for honesty is well known to me. Yet the horse is the twin of my horse. A suspicious man would believe his eyes instead of his heart. Good day, my young friends.'"
Clearly, John Byro knows that this horse is really his, but he does not want to accuse the boys of theft. After all, their tribe is well-known for its honesty. Perhaps he wants to give the boys the chance to do the right thing.
Whatever the case, the boys do the right thing. They return the horse to John Byro the very next day.