Commentary On Revelation by E.W. Bullinger
refers to Genesis iii., the promise being |Be thou faithful unto death, and I will give thee the crown of life.| |He that overcometh shall not be hurt of the second death| (ii.10, 11). The reference is to Genesis iii., where death first enters. But the promise goes beyond this; for it relates not merely to the death which came in with sin, but to the |second death,| which is revealed in Rev. xx.14; xxi.8.