οἵα

From LSJ

σκληρόν σοι πρὸς κέντρα λακτίζειν → it is hard for thee to kick against the pricks, it is hard for you to kick against the goads

Source

French (Bailly abrégé)

fém. sg. de οἷος.

Russian (Dvoretsky)

οἵα: f к οἷος.