response

And as they were speaking to the people, the priests and the captain of the temple and the Sadducees came upon them, greatly annoyed because they were teaching the people and proclaiming in Jesus the resurrection from the dead. And they arrested them and put them in custody until the next day, for it was already evening. But many of those who had heard the word believed, and the number of the men came to about five thousand. (Acts 4:1-4, ESV)

Peter preaches very similar sermons in chapters 2 and 3. In both cases, a lot of people believe but we also see the other response that the gospel can have after this second sermon. We should expect both negative and positive reactions to the good news about Jesus. His own words divided opinion and it was no different for the early church. Often we either expect only negative reactions and so are reluctant to even share the gospel. Or we only want to do it when we think there will be a positive reaction. Our mission is to share it. The reaction is out of our hands.