law: Transfer of Property Act, 1882
  38. Transfer by person authorized only under certain
  
  circumstances to transfer
  Where any person, authorized only under circumstances in their
  
  nature variable to dispose of immovable property, transfers such property for
  
  consideration, alleging the existence of such circumstances, they shall, as
  
  between the transferee on the one part and the transferor and other persons (if
  
  any) affected by the transfer on the other part, be deemed to have existed, if
  
  the transferee, after using reasonable care to ascertain the existence of such
  
  circumstances, has acted in good faith.
  Illustration
  A, a Hindu widow, whose husband has left collateral heirs,
  
  alleging that the property held by her as such is insufficient for her
  
  maintenance, agrees, for purposes neither religious nor charitable to sell a
  
  field, part of such property, to B. B satisfies himself by reasonable enquiry
  
  that the income of the property is insufficient for A's maintenance, and that
  
  the sale of the field is necessary, and acting in good faith, buys the field
  
  from A. As between B on the one part and A and the collateral heirs on the
  
  other part, a necessity for the sale shall be deemed to have existed.