law: Indian Trusts Act, 1882 
  52. Trustee for sale or his agent may not buy 
  No trustee whose duty it is to sell trust-property, and no agent
  
  employed by such trustee for the purpose of the sale, may, directly or
  
  indirectly, buy the same or any interest therein, on his own account or as
  
  agent for a third person.