ἀναγκαίη
From LSJ
Οὕτως γὰρ ἠγάπησεν ὁ Θεὸς τὸν κόσμον, ὥστε τὸν Υἱὸν τὸν μονογενῆ ἔδωκεν, ἵνα πᾶς ὁ πιστεύων εἰς Αὐτὸν μὴ ἀπόληται ἀλλ᾽ ἔχῃ ζωὴν αἰώνιον → For God so loved the world that he gave his only begotten Son that whosoever believeth in him should not perish but have everlasting life (John 3:16)
English (LSJ)
ἡ, Ep. and Ion, for ἀνάγκη, Il.6.85, Tyrt.6, Sol.36.8, Hdt.1.11, etc.
German (Pape)
[Seite 183] fem. von ἀναγκαῖος, als substant. Homerisch = ἀνάγκη, das adjectiv. statt des subst., wie z. B. παρθενική statt παρθένος u. s. w. Iliad. 4, 300 ἀναγκαίῃ πολεμίζειν; 6, 85 Od. 19, 73 ἀναγκαίη γὰρ ἐπείγει; Her. 1, 74.