εἴης

From LSJ

ἀλλὰ ῥῦσαι ἡμᾶς ἀπὸ τοῦ πονηροῦ → but deliver us from evil

Source

French (Bailly abrégé)

poét. εἴησθα;
2ᵉ sg. opt. de εἰμί.