ἕσσον

From LSJ

μὴ κακὸν εὖ ἔρξῃς· σπείρειν ἴσον ἔστ' ἐνὶ πόντῳ → do no good to a bad man; it is like sowing in the sea

Source

French (Bailly abrégé)

impér. ao. Act. de ἕννυμι.

Russian (Dvoretsky)

ἕσσον: эп. imper. aor. к ἕννυμι.