The followers of Jesus changed. Their lives were immediately and permanently altered by their belief in the risen Christ. 
 
Peter became a preacher. This is significant because he was afraid before. He disowned Jesus. 
 
Matthew 26:69-74 (NIV)

Peter Disowns Jesus

69 Now Peter was sitting out in the courtyard, and a servant girl came to him. “You also were with Jesus of Galilee,” she said.
70 But he denied it before them all. “I don’t know what you’re talking about,” he said.
71 Then he went out to the gateway, where another servant girl saw him and said to the people there, “This fellow was with Jesus of Nazareth.”
72 He denied it again, with an oath: “I don’t know the man!”
73 After a little while, those standing there went up to Peter and said, “Surely you are one of them; your accent gives you away.”
74 Then he began to call down curses, and he swore to them, “I don’t know the man!”
Immediately a rooster crowed.
 
Now Peter is addressing the crowd and the leaders, under threat of death. Peter is not afraid anymore, and he never denies Jesus again. 
 
Acts 2:14-24 (NIV)

Peter Addresses the Crowd

14 Then Peter stood up with the Eleven, raised his voice and addressed the crowd: “Fellow Jews and all of you who live in Jerusalem, let me explain this to you; listen carefully to what I say. 15 These people are not drunk, as you suppose. It’s only nine in the morning! …
 
22 “Fellow Israelites, listen to this: Jesus of Nazareth was a man accredited by God to you by miracles, wonders and signs,which God did among you through him, as you yourselves know. 23 This man was handed over to you by God’s deliberate plan and foreknowledge; and you, with the help of wicked men,[b] put him to death by nailing him to the cross. 24 But God raised him from the dead, freeing him from the agony of death, because it was impossible for death to keep its hold on him.
 

Acts 2:36-3:10 (NIV)

36 “Therefore let all Israel be assured of this: God has made this Jesus, whom you crucified, both Lord and Messiah.”
37 When the people heard this, they were cut to the heart and said to Peter and the other apostles, “Brothers, what shall we do?”
38 Peter replied, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins.And you will receive the gift of the Holy Spirit. 39 The promise is for you and your children and for all who are far off—for all whom the Lord our God will call.”
40 With many other words he warned them; and he pleaded with them, “Save yourselves from this corrupt generation.”41 Those who accepted his message were baptized, and about three thousand were added to their number that day.
 
The Fellowship of the Believers
42 They devoted themselves to the apostles’ teaching and to fellowship, to the breaking of bread and to prayer.43 Everyone was filled with awe at the many wonders and signs performed by the apostles. 44 All the believers were together and had everything in common. 45 They sold property and possessions to give to anyone who had need. 46 Every day they continued to meet together in the temple courts. They broke bread in their homes and ate together with glad and sincere hearts, 47 praising God and enjoying the favor of all the people. And the Lord added to their number daily those who were being saved.
 

Peter Heals a Lame Beggar

3 One day Peter and John were going up to the temple at the time of prayer—at three in the afternoon. 2 Now a man who was lame from birth was being carried to the temple gate called Beautiful, where he was put every day to beg from those going into the temple courts. 3 When he saw Peter and John about to enter, he asked them for money. 4 Peter looked straight at him, as did John. Then Peter said, “Look at us!” 5 So the man gave them his attention, expecting to get something from them.
 
6 Then Peter said, “Silver or gold I do not have, but what I do have I give you. In the name of Jesus Christ of Nazareth,walk.” 7 Taking him by the right hand, he helped him up, and instantly the man’s feet and ankles became strong. 8 He jumped to his feet and began to walk. Then he went with them into the temple courts, walking and jumping, and praising God. 9 When all the people saw him walking and praising God, 10 they recognized him as the same man who used to sit begging at the temple gate called Beautiful, and they were filled with wonder and amazement at what had happened to him.
 
  • They spent time together listening to teaching, sharing meals, and praying.
  • They became radically generous. 
  • They preferred the poor. 
  • They were glad and sincere. 
  • They believed in and received miracles. 
This is the kind of community we are and are becoming