A.T. Robertson Commentary Acts 1:21

"Of the men therefore that have companied with us all the time that the Lord Jesus went in and went out among us," — Acts 1:21 (ASV)

Must (δε). Present necessity corresponding to the old necessity (εδε) about Judas (verse 16). This sentence in verses 21,22 begins with δε.

That (ω). Locative case of the relative attracted to the case of the antecedent.

Went in and went out (εισηλθεν κα εξηλθεν). Constative aorist active.

With us (εφ' ημας).

Over us , the margin has it. But the full phrase would be εφ' ημας κα αφ' ημων. He came to us and went from us (Knowling).