Acts 1:4

4, 5. To account for the delay of the apostles in Jerusalem after receiving their commission, and to prepare the reader for the scenes of the coming Pentecost, the historian next relates a part of the conversation which had taken place on the day of the ascension: (4) “ And being assembled with them, he commanded them not to depart from Jerusalem, but to await the promise of the Father, which you have heard from me. (5) For John, indeed, immersed in water; but you shall be immersed in the Holy Spirit, not many days hence.” The command not to depart from Jerusalem is mistaken, by some commentators, for the commandment mentioned above, as being given on the day he was taken up. But, in truth, as we have already seen, the commission constituted that commandment, while this is merely a limitation of the commission, in reference to the time and place of beginning. The “ promise of the Father” which they were to await, is the promise of the Holy Spirit, which they had heard from him on the night of the betrayal, and which they now learn, is to be fulfilled in by their immersion in the Spirit. On this use of the term immersion see the Commentary, ii. 16 18.