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

 The phrase, "What have I to do with thee?" was a common conversational phrase. When it was uttered angrily and sharply it did indicate complete disagreement and reproach, but when it was spoken gently it indicated not so much reproach but misunderstanding. It means: "Don't worry; you don't quite understand what is going on; leave things to me, and I will settle them in my own way." Jesus was simply telling Mary to leave things to him, that he would have his own way of dealing with the situation. 