the.com/good samaritan

means A person who stops to help someone in trouble, with no obligation and no reward, simply because they could.

from From a parable in the Christian gospel of Luke, where a traveler is beaten and left for dead, ignored by a priest and a Levite, and finally helped by a Samaritan — a member of a group Jews of that era generally despised and distrusted. The sting of the story was precisely that the 'right' people walked past, and the outsider stopped. The phrase entered everyday English as a title for anyone who aids a stranger with no self-interest attached, the religious specifics worn away but the moral twist still intact.