Abbott-Smith Manual Greek Lexicon
δεῖ (G1163)
11 δεῖ impersonal ( δέω ), [in LXX chiefly for infin. with לְ ;] one must, it is necessary : c. inf., Mt 26:54 , Mk 13:7 , Ac 5:29 , al.; c. acc. et inf., Mt 16:21 , Mk 8:31 , Jo 3:7 , Ac 25:10 , al.; with ellipse of acc., Mt 23:23 ; of acc., and inf., Mk 13:14 , Ro 1:27 8:26 ; οὐ (μὴ) δεῖ ( non licet ), ought not, must not : Ac 25:24 , II Ti 2:24 ; impf., ἔδει , of necessity or obligation in past time regarding a past event (Bl., § 63, 4), Mt 18:33 , Lk 15:32 , Jo 4:4 , Ac 27:21 , al.; periphr., δέον ἐστίν (as in Attic, χρεών ἐστι = χρή , v.s. δέον ), Ac 19:36 ; id., with ellipse of ἐστίν , I Pe 1:6 τὰ μὴ δέοντα (= ἃ οὐ δεῖ I Ti 5:13 . SYN. : ὀφείλει , expressing moral obligation, as distinct from δεῖ , denoting logical necessity and χρή , a need which results from the fitness of things (v. Tr., Syn. , § cvii, 10; Westc. on He 2:1 , I Jo 2:6 ; Hort on Ja 3:10 ).
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain