ἐπιστητέον

ποταμῷ γὰρ οὐκ ἔστιν ἐμβῆναι δὶς τῷ αὐτῷ → it is impossible to step twice in the same river, you cannot step twice into the same rivers

Click links below for lookup in third sources:

Full diacritics: ἐπιστητέον	Medium diacritics: ἐπιστητέον	Low diacritics: επιστητέον	Capitals: ΕΠΙΣΤΗΤΕΟΝ
Transliteration A: epistētéon	Transliteration B: epistēteon	Transliteration C: epistiteon	Beta Code: e)pisthte/on

English (LSJ)

one must know, Sch.D.T.p.316H., An.Ox.3.207.

ἐπιστητέον: ῥημ. ἐπίθ. τοῦ ἐπίσταμαι, δεῖ ἐπίστασθαι, Ἀνέκδ. Κραμήρου τ. 3. σ. 207. 14, κτλ.