Ask at the forum if you have an Ancient or Modern Greek query!

οἶν

From LSJ

Ὑπὲρ εὐσεβείας καὶ λάλει καὶ μάνθανε → Ea fator atque disce, quae pietas probat → Dein Sprechen, Lernen diene nur der Frömmigkeit

Menander, Monostichoi, 521

French (Bailly abrégé)

acc. de οἶς.

Russian (Dvoretsky)

οἶν: acc. к οἶς.