ταριχοπώλης
From LSJ
οὐκ ἂν λάβοις παρὰ τοῦ μὴ ἔχοντος → you can't take from one who doesn't have, you can't squeeze blood out of a turnip, you can't get blood out of a turnip, you can't get blood from a stone, you can't get blood out of a stone
English (LSJ)
ου, ὁ,
A dealer in salt fish, Nicostr.Com.5.3, Alex.15.14, Plu.2.631d, Gloss.
German (Pape)
[Seite 1071] ὁ, der eingesalzene Fische verlaust; Nicostrat. bei Ath. III, 118 e; auch 120 e für τεμαχοπώλης zu lesen bei Antiphan.; Luc. Vit. auct. 11; Plut. Symp. 2, 1, 4.