A good Samaritan
Definition 1 of 1
Pro Tip 1/3Cultural Origin
Comes from a parable in the Bible where a Samaritan helps an injured man, showing compassion regardless of ethnicity. 
Like the good Samaritan in the Bible, she assisted the lost tourist.
Pro Tip 2/3Beyond Duty
Emphasizes voluntary help, more than what is expected or required by the situation. 
He went out in the storm to rescue the kitten, a true good Samaritan.
Pro Tip 3/3Unsolicited Assistance
Involves offering help without being asked, suggesting self-initiative and altruism. 
Seeing the boy cry, the good Samaritan comforted him and found his parents.