Acts 1:21

δεῖ οὖν, see Acts 1:16. As the one prophecy had thus already been fulfilled, so for the fulfilment of the other it was imperative upon the Church to elect a successor to Judas. εἰσῆλθε καὶ ἐξῆλθεν : a Hebraistic formula expressing the whole course of a man's daily life; Acts 9:28; cf. LXX Deuteronomy 28:6; 1 Samuel 29:6, Psalms 120:8, and for other instances, Wetstein, in loco. There is no occasion to render ἐφʼ ἡμᾶς, “over us,” R.V., margin, for in full the phrase would run: εἰσῆλθεν ἐφʼ ἡμᾶς καὶ ἐξῆλθεν ἀφʼ ἡμῶν. The formula shows that St. Peter did not shrink from dwelling upon the perfect humanity of the Ascended Christ, whilst in the same sentence he speaks of Him as ὁ Κύριος.