Acts 4:5–12 covers Peter and John’s defense before the Sanhedrin—the ruling Jewish council. The priests and other Sadducees have arrested Peter and John because after they healed a lame man, they taught a crowd that Jesus rose from the dead (Acts 3). The Sadducees don’t believe resurrection is possible and really don’t want to hear that a dissident they had killed has come back to life. They ask how Peter got the power to heal the man. Peter tells them, not only is Jesus alive, He’s the Messiah of the Jews and the only path to salvation.
For a more detailed summary select the link below.
“Acts 4:12” Bibleref.com
12 There is salvation in no one else, for there is no other name under heaven that is given among men, by which we must be saved!”