And when they had prayed, the place was shaken where they were assembled together; and they were all filled with the Holy Ghost, and they spake the word of God with boldness. And the multitude of them that believed were of one heart and of one soul: neither said any of them that ought of the things which he possessed was his own; but they had all things common. And with great power gave the apostles witness of the resurrection of the Lord Jesus: and great grace was upon them all. Neither was there any among them that lacked: for as many as were possessors of lands or houses sold them, and brought the prices of the things that were sold, And laid them down at the apostles’ feet: and distribution was made unto every man according as he had need.

Acts 4:31-35

This passionate prayer was made to God by the apostles and disciples in the face of growing and fierce persecution. Heaven instantly responded with the dense shower of the Holy Spirit. The dire threats drew their hearts to God and melted their hearts together in love until all selfishness vanished. I believe hell trembles when the saints are totally knit together in the love of Christ and that it fully unlocks the miracle-working power of God.