Acts 8:31; Acts 15:1; Acts 27:31

Acts 8:31

31 “How can I,” he said, “unless someone explains it to me?” So he invited Philip to come up and sit with him.

Acts 15:1

1 Certain people came down from Judea to Antioch and were teaching the believers: “Unless you are circumcised, according to the custom taught by Moses, you cannot be saved.”

Acts 27:31

31 Then Paul said to the centurion and the soldiers, “Unless these men stay with the ship, you cannot be saved.”