shekalim 10

the money-changers role in paying the workers before the work was done, keeps the money circulating and no misuse of temple property.

(the stonecutters for the temple were paid from the temple treasury. the wages would be paid by the money changers. once the work was done, the money from the treasury were piled on the stone, transferring sanctity from coin to stone. these coins then went to repay the money-changers)