John 3:18

He that believeth on him is not condemned
Whether Jew or Gentile, because a believer is openly in Christ; and there is no condemnation to those that are in him: and though the sentence of death passed upon all in Adam, and judgment came upon all men to condemnation in him; yet this sentence being executed on Christ, the surety of his people, who has been condemned to death, and has suffered it in their stead, his death is a security to them from all condemnation: and they are delivered by him from the curse and condemnation of the law: and having in conversion openly passed from death to life, they shall never enter into condemnation; and this is the happy case of every one that believes in Christ:

but he that believeth not is condemned already.
The Persic version renders it, "from the beginning"; he remains under the sentence of condemnation passed in Adam upon him; the law accuses him, and pronounces him guilty before God; he is under the curse of it, and it is a ministration of condemnation and death to him; nor has he any thing to secure him from its charge, curse, and condemnation: this must be understood of one that is a final unbeliever, or that lives, and dies, in a state of impenitence, and unbelief:

because he hath not believed in the name of the only begotten Son of
God;
whom God has sent to be the Saviour of lost sinners, and to deliver them from wrath to come; and there is no other name but his, whereby men can be saved; so that such that do not believe in him, must be damned.