Complete Peter's words: 'There is no other ___ under heaven given to men by which we must be saved.'

Answer: Name

Before the Sanhedrin, Peter declared that salvation is found in no one else but Jesus Christ of Nazareth, for there is no other name.

“then let this be known to all of you and to all the people of Israel: It is by the name of Jesus Christ of Nazareth, whom you crucified but whom God raised from the dead, that this man stands before you healed.”— Acts 4:10 (BSB)