The First Death is Spiritual Death.
All human beings have suffered this First Death.
This Death of our Spirit, Toward God, does result in Physical Death.
There would be no Physical Death without Separation from God, which our Dead Spirit accomplishes.
Our Dead Spirit, as a result of The First Death, CAN NOT & DOES NOT "RELATE to GOD", Who IS SPIRIT.
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The First Resurrection is the Birth from Above, in the lost Spiritually Dead soul, that Jesus Brings the sinner FROM Spiritually Dead Death to ETERNAL LIFE with God's Spirit.
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Blessed and holy are those who share in the first resurrection!
The second death has no power over them,
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Which brings us to The Second Death.
This would be losing Physical Life, WITHOUT JESUS,
and Entering into an Eternity of Spiritual Death, yes.
The Second Death is what it is called.