Acts 4:13, 31

Now when the men of the Sanhedrin (Jewish High Court) saw the confidence and boldness of Peter and John, and grasped the fact that they were uneducated and untrained [ordinary] men, they were astounded, and began to recognize that they had been with Jesus.

And when they had prayed, the place where they were meeting together was shaken [a sign of God’s presence]; and they were all filled with the Holy Spirit and began to speak the word of God with boldness and courage.