He found in the temple those who sold oxen, sheep, and doves, and the changers of money sitting.

 Here we have two reactions. First, there is the reaction of the disciples which was to remember the words of Psalms 69:9. The point is that this Psalm was taken to refer to the Messiah. When the Messiah came he would be burned up with a zeal for the house of God. When this verse leapt into their minds, it meant the conviction that Jesus was the Messiah seized the minds of the disciples even more deeply and more definitely. This action befitted none but the Messiah, and they were surer than ever that Jesus was in fact the Anointed One of God. 