law: Transfer of Property Act, 1882
  43. Transfer by unauthorized person who subsequently
  
  acquires interest in property transferred
  Where a person fraudulently or erroneously represents that he is
  
  authorized to transfer certain immovable property and professes to transfer
  
  such property for consideration, such transfer shall, at the option of the
  
  transferee, operate on any interest which the transferor may acquire in such
  
  property at any time during which the contract of transfer subsists.
  Nothing in this section shall impair the right of transferees in
  
  good faith for consideration without notice of the existence of the said
  
  option.
  Illustration
  A, a Hindu who has separated from his father B, sells to C three
  
  fields, X, Y and Z, representing that A is authorized to transfer the same. Of
  
  these fields Z does not belong to A, it having been retained by B on the
  
  partition; but on B's dying A as heir obtains Z. C, not having rescinded the
  
  contract of sale, may require A to deliver Z to him.