Acts 1:4

And being assembled together with them; by his order, or conversing frequently with them, as those that table together. Commanded them that they should not depart from Jerusalem: otherwise the apostles would have abhorred Jerusalem, as reeking afresh in the blood of our Lord. And there Christ chose to pour out his Spirit, that he might show forth his glory in the same place where he suffered ignominy: there Christ would have his apostles to abide, that they might be closer to Mount Olivet, from whence he was to ascend; as also that both his ascension, and the coming of the Holy Ghost, might more publicly be manifest; and that that prophecy, Isaiah 2:3, might be fulfilled. The promise of the Father; of my Father, Luke 24:49; that is, the Holy Spirit, promised by our Saviour in his Father's name, 1 Thessalonians 14:26; and may well be called the promise, without which all other promises would be of no value unto us.