Albert Barnes Commentary Acts 1:4

"and, being assembled together with them, he charged them not to depart from Jerusalem, but to wait for the promise of the Father, which, [said he], ye heard from me:" — Acts 1:4 (ASV)

And being assembled together. Margin: "or, eating together." This meaning is given to this passage in the Latin Vulgate, Ethiopic, and Syriac versions. However, the Greek word does not properly have this meaning; it signifies congregating or assembling. It should, however, have been translated in the active sense: "and having assembled them together."

The apostles were scattered after His death. But this passage indicates that He had assembled them by His authority, to give them instructions concerning their conduct for when He would leave them.

When this occurred is not apparent from the narrative, but it was probably not long before His ascension. It is clear that the place where they were assembled was Jerusalem.

But wait for the promise of the Father. For the fulfillment of the promise concerning the descent of the Holy Spirit, made by the Father.

Which you have heard of Me. Which I have made to you. See John 14:16, 26; 15:26; 16:7-13.