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ἴστε

Ἐὰν ᾖς φιλομαθής, ἔσει πολυμαθής -> If you are studious, you will become learned.
Isocrates, 1.18

French (Bailly abrégé)

2ᵉ pl. ind. ou impér. de οἶδα.

Greek Monotonic

ἴστε: βʹ πληθ. του οἶδα.

Russian (Dvoretsky)

ἴστε: 2 л. pl. pf. к *εἴδω.