εὐορκία
From LSJ
ἀσκεῖν περὶ τὰ νοσήματα δύο, ὠφελεῖν ἢ μὴ βλάπτειν → strive, with regard to diseases, for two things — to do good, or to do no harm | as to diseases, make a habit of two things — to help, or at least, to do no harm
English (LSJ)
ἡ, = foreg., Pi.O.2.66 (pl.), App.Pun.63, Hierocl. in CA2p.422M. II in pl., oaths taken with a good conscience, Lib.Or.59.122.
German (Pape)
[Seite 1085] ἡ, dass., plur., Pind. Ol. 2, 72; Poll. 1, 39.