Brewer's: Itching Palm
(An). A love of money. If the palm of your right hand itches, it betokens that you are going to receive money. So Melton tells us in his Astrologaster, p. 23.
Let me tell you, Cassius, you yourself Are much condemned to have an itching palm.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894