Davus
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
Latin > English (Lewis & Short)
Dāvus: (Davos), i, m.,
I a name given to Roman slaves, freq. in the comedies of Plaut. and Ter.; cf. also Hor. S. 1, 10, 40; 2, 5, 91; id. A. P. 114; Pers. 5, 161; 168 al. —Prov.: Davus sum, non Oedipus, Ter. Andr. 1, 2, 24.
Latin > German (Georges)
Dāvus (Dāvos), ī, m., ein röm. Sklavenname, zB. in Ter. Andr., s. bes. v. 194 u.a.