Reference

Matthew 18:19-20 ESV
Worship creates the atmosphere of God's Presence!

God’s presence is activated through the line of worship. Jesus looked ahead to a new day when he would be present with his followers not in body but through his Holy Spirit. In the body of believers, the church, the sincere agreement of two people in prayer is more powerful than the superficial agreement of thousands because Christ’s Holy Spirit is with them. Two or more believers, filled with the Holy Spirit, will pray according to God’s will, not their own; thus, their requests will be granted. That is exclectly what took place in the upperroom in the day of pentecost.