Bede the Venerable

(ubi sup.) A question is raised, however, how James and John drank the cup of martyrdom, or how they were baptized with the baptism of the Lord, when the Scripture relates, that only James the Apostle was beheaded by Herod whilst John finished his life by a natural death. But if we read ecclesiastical histories, in which it is related, that he also on account of the witness which he bore was cast into a cauldron of burning oil, and was immediately sent away to the island of Patmos, we shall then see that the spirit of martyrdom was in him, and that John drank the cup of confession, which the Three Children also drank in the furnace of fire, though the persecutor did not spill their blood. It goes on: But to sit on my right hand and on my left hand is not mine to give, but it shall be given to them for whom it is prepared.