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The Bible tells us in Revelation 1:9 that the apostle John was exiled for his faith late in life. However, given the apostle John was probably the last to die, there is nothing in the Bible about how he died.
The most plausible tradition regarding Johnβs death states that John was arrested in Ephesus and faced martyrdom when his enemies threw him in a huge basin of boiling oil. However, according to the tradition, John was miraculously delivered from death. The authorities then sentenced John to slave labor in the mines of Patmos. On this island in the southern part of the Aegean Sea, John had a vision of Jesus Christ and wrote the prophetic book of Revelation. The apostle John was later freed, possibly due to old age, and he returned to what is now Turkey. He died as an old man sometime after AD 98, the only apostle to die peacefully.
We don't need to know how John died, only that he was not ashamed of Christ (see Luke 9:26) and was willing to die for his faith. A man will not die for something he knows to be a lie. John knew the truth that Jesus had been resurrected, and he was willing to die rather than to renounce his faith in his Savior.
Edit (to supply additional information and sources: https://www.britannica.com/biography/Saint-John-the-Apostle
Mark's Gospel hints of John's martyrdom, but his death as a martyr is unknown. The theologian Tertullian reported that John was plunged into boiling oil but miraculously escaped unscathed.
Another source (which mentions other traditions relating to John's death): https://en.wikipedia.org/wiki/John_the_Apostle#Extrabiblical_traditions
According to Tertullian (in The Prescription of Heretics) John was banished (presumably to Patmos) after being plunged into boiling oil in Rome and suffering nothing from it.
This is the article from which I partially quoted: https://www.gotquestions.org/apostle-John-die.html
Regardless of how the apostle John died, he certainly suffered for his faith and endured many hardships. Tradition has several theories, but the Bible does not tell us the manner of his death.