The pouring out of the Holy Spirit upon all people was an event predicted in the Old Testament and brought nearer by John the Baptist's revelation of Jesus as the one who would baptize with the Holy Spirit. Jesus promised to send the Holy Spirit to dwell forever with the disciples after his ascension. The disciples, and others, have been waiting in Jerusalem for God to fulfill this promise. It is now the day of Pentecost and Jerusalem is filled with Jews from all over the world. Something dramatic happens in the upper room where the disciples are gathered, then spills out into the streets of Jerusalem. The promised Spirit has come! The church is ready to explode.