GRC

ἰστέον

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LSJ

(< *εἴδω, οἶδα) one must see, ἰστέον δή Pl. Tht. 202e; ἰ. ἤδη τί ἐστὶ τὸ πρᾶγμα Id. Smp. 217c.
one must know, Gal. 5.480, Sch. Nic. Th. 11.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
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