c. 1696.  B. E., A New Dictionary of the Canting Crew, s.v. HARKING, whispering on one side to borrow Money.
 
  1725.  A New Canting Dictionary, s.v.
 
  1785.  GROSE, A Classical Dictionary of the Vulgar Tongue, s.v. HARK-YE-ING. Whispering on one side to borrow money.