Bible Verses About Eternal Death: The Necessary Consequence of Sin

Know ye not, that to whom ye yield yourselves servants to obey, his servants ye are to whom ye obey; whether of sin unto death, or of obedience unto righteousness?

What fruit had ye then in those things whereof ye are now ashamed? for the end of those things is death.

For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live.

Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death.