http://en.wikipedia.org/wiki/Jesus_and_the_money_changers
In Mark 12:40 and Luke 20:47 Jesus accuses the Temple authorities of thieving and this time names poor widows as their victims, going on to provide evidence of this in Mark 12:42 and Luke 21:2. Dove sellers were selling doves that were sacrificed by the poor who could not afford grander sacrifices and specifically by women. According to Mark 11:16, Jesus then put an embargo on people carrying any merchandise through the temple—a sanction that would have disrupted all commerce.[4][7]
And making a whip of cords, he drove them all out of the temple, with the sheep and oxen. And he poured out the coins of the money-changers and overturned their tables. And he told those who sold the pigeons, "Take these things away; do not make my Father's house a house of trade."[