βάλοισθα

From LSJ

Κύριε, σῶσον τὸν δοῦλον σου κτλ. → Lord, save your slave ... (mosaic inscription from 4th cent. church in the Negev)

Source

French (Bailly abrégé)

2ᵉ sg. épq. opt. ao.2 de βάλλω.