My grand son's class is studying the parable of the good Samaritan in school this week? he is in catholic scho?

Mr. Smartypants has it right. All I'll add is that the first two travelers who went by the injured man without stopping were a priest and a Levite, both highly religious men. As far as following the letter of the law you probably couldn't have found better, but they lacked the compassion to stop and help.