John 2:16-17

To those who sold the doves he said, “Take these things away from here! Do not make my Father’s house a marketplace!” His disciples remembered that it was written, “Zeal for your house will devour me.”

Jesus' reaction to seeing His Father's house turned into a marketplace is quite personal. The house of God is supposed to be about God, not about profits, doves, sheep, cattle, or whatever else was being sold. The house of God should be a place where people can approach God in worship and come into right relationship with Him - this was a main point of the extensive detail of the tabernacle. (see Exodus) The "once and for all" High Priest has hit the scene, and is setting the record straight about who God is, and how to come to Him (through Christ alone).