He that has an ear, let him hear what the Spirit says unto the churches; To him that overcomes will I give to eat of the tree of life, which is in the midst of the paradise of God.
All Commentaries on Revelation 2:7 Go To Revelation 2
Cyprian of Carthage
AD 258
Also in the same place: "He who shall overcome I will give him to eat of the tree of life, which as in the paradise of my God."