According to Luke, Peter then exhorted the large crowd gathered there: “Repent, and be baptized every one of you in the Name of Jesus Christ…, and you shall receive the gift of the Holy Ghost! For the promise is to you and to your children.”
Later, Peter “filled with the Holy Ghost” — and John — testified to the Judaistic leaders who had rejected Christ. Those Apostles then returned to the other Disciples.
“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 spoke the Word of God with boldness.”