The apostles pray for God's help (Acts 4:23-31). The believers share their property (Acts 4:32-37). The Lord is doing a mighty work among His people. At the heart of this work of God, there is "the Holy Spirit" (Acts 4:31).
God was doing a mighty work - and He was protecting it. Satan was trying to destroy the work of God - but God was one step ahead of him. This work must go on. It must not be spoiled. Following on from the act of divine judgment (Acts 5:1-11), there was great blessing (Acts 5:12-16). The judgment came so that Satan may be prevented from having a mighty triumph over God's people. This judgment paved the way for the blessing. First, there was God's purifying judgment. Then, there was His abundant blessing.