Clearing out the temple
Back in Jesus' day people would make sacrifices at the temple. Because some people had to travel from far away, it was easier to buy a sacrifice at the temple then to try and bring one with you. Well some people began to take advantage of this and started selling sacrifices at crazy prices. Because the people had no other choice they had to buy them. Jesus was mad because they were taking advantage of people and saying God wanted them to do it.
