<p>2:2 <i>And suddenly there came from heaven a sound like the rushing of a mighty wind, and it filled all the house where they were sitting</i>- This seems to be intentionally contrasted with the fact they were sitting in the &quot;upper room&quot; of that house. Perhaps the idea is that the activity of God with the apostles was to be seen throughout the entire house / body of believers. Or maybe the allusion is to the glory of God filling the entire house of Solomon's temple. The body of Christ was now the temple, and God had accepted it by filling it with His Spirit.</p>