New York Judiciary Law Section 19 - Judge must not be interested in costs.

  19.  Judge  must  not  be  interested  in costs. A judge shall not,
  directly or indirectly, be interested in the costs of an action,  claim,
  matter, motion or proceeding, brought before him, or in a court of which
  he  is,  or  is  entitled  to  act as a member, except an action, claim,
  matter, motion or proceeding to which he is a party, or in which  he  is
  interested.

Last modified: February 3, 2019