That Pentecost morning in Jerusalem saw quite a stir for three reasons. Firstly, the Holy Spirit had been given to the apostles and the once-petrified men (John 20:19) were now unafraid to speak to the gathering crowd. Secondly, the apostles spoke in many identifiable languages about what God had done through Jesus (Acts 2:6-12). Thirdly, the Holy Spirit empowered Peter to tell the crowd, who had demanded Jesus' death (Luke 23:23), that He was now alive; those who put Him to death (Acts 2:22-23) were afraid of retribution (Acts 2:37).