Through the parable of the good Samaritan, Jesus teaches about charity. As Jesus often does, he turns the question of “who is my neighbor?” on its head and instead answers “who might be a neighbor to me?" 

> 25 And behold, a lawyer stood up to put him to the test, saying,
> “Teacher, what shall I do to inherit eternal life?” 
> 
> 26 He said to him, “What is written in the Law? How do you read it?” 
> 
> 27 And he answered, "You shall love the Lord your God with all your
> heart and with all your soul and with all your strength and with all
> your mind, and tyour neighbor as yourself.” 
> 
> 28 And he said to him, “You have answered correctly; do this, and you
> will live.”
> 
> 29 But he, desiring to justify himself, said to Jesus, “And who is my
> neighbor?”

Jesus teaches that God has made our neighbors - everywhere. In some sense, this teaching has technically undermined the traditional usage of the word 'neighbor'.

Does this teaching really undermines taking someone who lives next door as a neighbor or everybody anywhere that renders an act of charity to us? Who really is my neighbor?