In the parable, who stops to help the wounded traveler after a priest and a Levite pass by?

'But a Samaritan, as he traveled, came upon him, and when he saw him, he had compassion.' The one least expected to help — a social outsider — becomes the story's model of neighborly love.

Luke 10:33 · BSB

“But a Samaritan on a journey came upon him, and when he saw him, he had compassion.”