John 3:18
"He that believeth on him is not condemned: but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God."
Cross References (ranked by relevance)
He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life.
He that believeth on the Son hath everlasting life: and he that believeth not the Son shall not see life; but the wrath of God abideth on him.
Therefore being justified by faith, we have peace with God through our Lord Jesus Christ:
But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.
Verily, verily, I say unto you, He that believeth on me hath everlasting life.
Who is he that condemneth? It is Christ that died, yea rather, that is risen again, who is even at the right hand of God, who also maketh intercession for us.
And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.
No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared him.
How shall we escape, if we neglect so great salvation; which at the first began to be spoken by the Lord, and was confirmed unto us by them that heard him;
See that ye refuse not him that speaketh. For if they escaped not who refused him that spake on earth, much more shall not we escape, if we turn away from him that speaketh from heaven: