Now that Peter has gotten the attention of several thousand people, he shares in a way they can understand. These several thousand presumably included women and children. Jewish custom only recorded the men, of whom 2,000 later gave their lives to Jesus. The Holy Spirit got their attention when Peter and John healed the lame man. He entered the temple for the first time, leaping and jumping and praising God.
13 “The God of Abraham, the God of Isaac, and the God of Jacob, the God of our fathers, glorified His servant Jesus, whom you delivered over and denied in the presence of Pilate, when he had decided to release him.” (Peter)
Peter started off sharing a Scripture familiar to all present: Exodus 3:6. This was a part of the five books of Moses which some Jewish men (the Pharisees) were required to memorize. Those who were not Pharisees no doubt had heard the verse also.
Then Peter does something highly unusual. He connected the God of the Pentateuch, YHWH, the Ineffable, to Jesus! Peter called Jesus YHWH’s Servant!
When Peter stated that God had glorified His Servant Jesus, he was actually alluding to Isaiah 55:5 and Isaiah 52:13, which both speak of the Holy One of Israel/His Servant being high and lifted up. The Torah scholars in the crowd would have understood the implications immediately. Jesus is God!
Peter ends his sentence with a stern rebuke of the crowd. They were all (even as we are all) responsible for the death of Jesus, directly or indirectly. They either participated in or gave tacit approval to what happened to Jesus. Much like today, when we don’t give Christ pre-eminence in our lives we crucify Him in our hearts. When we choose our way over His way, we again deny Him to His face.