Bede

Now there was there a man of the servants of Saul... and his name was Doeg, etc. There were among the preaching apostles false brothers, the foremost being Judas; indeed within the Church, constituted by the mystery of faith, but moved from the firmness of their stability, bloodthirsty to betray the peace of fraternity (for Doeg is called the Edomite, a bloodthirsty man), the most powerful of the Jewish persecutors, because he received it recently. …

Commentary on Samuel ↗