Episode 35 of "Supernatural"
s02e13 Houses of the Holy
Title: Houses of the Holy
Original Air Date: 02/01/2007
Plot Outline:
Sam (Jared Padalecki) and Dean (Jensen Ackles) investigate the murders of several people by individuals who claim they were visited by an angel and were carrying out God's will. After the brothers learn those murdered were actually guilty of secret crimes, Sam begins to believe this angel really does exist, but Dean stands firm on the fact a demon is behind the slayings - until he sees something even he can't explain.