"Let every man abide in the art or employment wherein he was called. And for their labor they may receive all necessary things, except money. ... Let none of the brothers, wherever he may be or whithersoever he may go, carry or receive money or coin in any manner, or cause it to be received, either for clothing, or for books, or as the price of any labor, or indeed for any reason, except on account of the manifest necessity of the sick brothers."