DEUT897 The King of Israel shall not accumulate great quantities of silver and gold. The King of Israel shall not accumulate a fortune of wealth. He may own all that is necessary for the upkeep of his residence, servants and household. The king violates his prohibition if he accumulates wealth for personal purposes, without intent to use it for the sake of the people. His punishment is very great, for the nation depends upon him., and his thoughts and efforts must be for the sake of the nation. He cannot be concerned with self-glorification and gratification of his lusts. Key concept is as the verse says, “so that His heart does not become raised above his brethren, and so that he does not turn aside from the commandment either to the right or to the left.” The mitzvah helps to prevent him from becoming haughty and oppressive of his underlings, from deviating from Torah or Rabbinic law [or a minor mitzvah of a Prophet: Rashi].