The Jewish leaders threatened to punish Peter and John and then released them.

Acts 4:21-22

21-22 Then the Jewish leaders again told Peter and John not to disobey them. But all the people there were praising God about what had happened to the lame man. The leaders knew that only God could have enabled Peter and John to miraculously heal the man, because the man was more than 40 years old and he was lame when his mother bore him. They also knew that the people would become angry if they punished the two apostles. So, because they could not decide how to punish Peter and John, they finally let them go.