One day a Jewish man went to Jericho from Jerusalem (Luke 10:30-37). On the way some thieves robbed him. They took all his clothes and wounded him very badly. The wounded man was in great pain, and he cried out for water.
Later on in the day a priest, who was of the same nationality as the wounded man, came down the road, and when he saw the wounded man he went to the other side of the roand and went away without helping the wounded man. After awhile a Levite, who was also of the same nationality as the wounded man, came and he looked at the man and also went away without helping him. Both of these men, the priest and the Levite, should have stopped and helped the wounded man, but neither of them did.
Then a Samaritan, who was of a different nationality than the Jewish wounded man, came by and when he saw him he stopped and helped him. He bound up his wounds and put the wounded man on his own camel and took him to an inn (or hotel) and took care of the wounded man.
When the good Samaritan left the next day, he gave the Innkeeper some money with which to take care of the wounded man and told the Innkeeper that if he needed more money that he would pay him.
In this parable, Jesus was showing the people that we should be like the good Samaritan who stopped and helped the wounded man (Galatians 5:22-23). Jesus said to his disciples, "Go and do thou likewise."