Abbott-Smith Manual Greek Lexicon
οὖν (G3767)
499 οὖν , particle expressing consequence or simple sequence (never standing first in a sentence), wherefore , therefore , then : Mt 3:10 , Lk 3:9 , Jo 8:38 , Ac 1:21 , Ro 5:9 , al.; in exhortations, Mt 3:8 , Lk 11:35 , Ac 3:19 , Ro 6:12 , al.; in questions, Mt 13:28 , Mk 15:12 , Jo 8:[5] , Ro 6:1 , al.; continuing a narrative or resuming it after a digression, Mt 1:17 , Lk 3:18 , Jo 1:22 2:18 (and very freq. in this Gospel), Ac 26:22 , al.; ἄρα οὖν (v.s. ἄρα ); ἐπεὶ οὖν , He 2:14 ; οὖν c. ptcp. (= ἐπεὶ οὖν ), Ac 2:30 , Ro 5:1 , al.; ἐὰν οὖν (where οὖν rather in sense belongs to the apodosis), Mt 5:23 , Lk 4:7 , Jo 6:62 , Ro 2:26 , al.; ὡς οὖν , Jo 4:1 , al.
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain