It is considered by some commentaries that 1 John was written from Ephesus about 90 AD.
John could not have continued to make his home in Jerusalem after the Jewish War of AD 66 which ended in the destruction of Jerusalem in AD 70. Before that event, James the Lord’s brother and Peter---who together with John formed the leadership of the early disciples (Gal. 2:9).
Peter, James and Paul met death in martyrdom.
John was left alone.
At that time, the church in Ephesus, founded by Paul, was being troubled with teachers bringing a Jewish form of Christianity (Gnosticism).
1 Tim. 6:20: Timothy, keep that which is committed to your trust, avoiding profane and vain babblings, and oppositions falsely called science (gnosis); which some professing have erred concerning the faith. Grace be with you. Amen.
Gnosticism: ( “having knowledge”) is a modern name for a variety of ancient religious ideas and systems, originating in Jewish-Christian milieus in the first and second century. They were teaching “another Jesus.” Several religions evolved out of Gnosticism including Buddhism.
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