And to the angel of the church in Pergamos write; These things saith he which hath the sharp sword with two edges;
Trench prefers Pergamus, or Pergamum: on the river Caicus. Capital of Attalus the Second's kingdom, bequeathed by him to the Romans, 133 BC Famous for its library, founded by Eumenes (197 BC - 159 BC), and destroyed by Caliph Omar. Parchment - i:e., Pergemena charta-was here discovered for book purposes. Also, famous for the magnificent temple of Esculapius, the healing god (Tacitus, Annals, 3:, 63).
He which hath the sharp sword with two edges - His address having a twofold bearing, a searching power to convict and convert some (Revelation 2:13; Revelation 2:17), and to condemn others (Revelation 2:14-16, especially Revelation 2:16: cf. note, Revelation 1:16).