The Samaritan's Neighbor (parable-ish)

As a man was journeying from Jericho to Jerusalem, he was attacked by thieves. They took everything he had, even the clothes from his back. Then they beat him senseless and left him for dead. 

A Samaritan walking on the same road found the man and immediately gave everything he had to dress the man's wounds and clothe him. 

While the Samaritan was nursing the wounded man on the side of the road, others passed by.

"You are doing it wrong!" one snarled.

"Mind your own business!" screamed another.

A third journeyman picked up a stick and began beating the Samaritan.

So, I ask you, which of these three was a neighbor to the Samaritan?