John 3
even so must the Son of man be lifted up; that whosoever believes may in him have eternal life.
For God so loved the world, that he gave his only Son, that whosoever believes on him should not perish, but have eternal life. For God sent not the Son into the world to judge the world; but that the world should be saved through him. He who believes on him is not judged: he who does not believe has been judged already, because he has not believed on the name of the only Son of God. . . .
He who believes on the Son has eternal life;
John 5:24
24 Verily, verily, I say to you, He who hears my word, and believes him who sent me, has eternal life, and does not come into judgment, but has passed out of death into life.
John 6
Jesus said to them, I am the bread of life: he who comes to me shall not hunger, and he who believes on me shall never thirst. But I said to you, that you have seen me, and yet believe not. All that which the Father gives me shall come to me; and him who comes to me I will in no wise cast out. For I have come down from heaven, not to do my own will, but the will of him who sent me. And this is the will of him who sent me, that of all that which he has given me I should lose nothing, but should raise it up at the last day. For this is the will of my Father, that everyone who who beholds the Son and believes on him, should have eternal life; and I will raise him up at the last day.
Verily, verily, I say to you, He who believes has eternal life. I am the bread of life. Your fathers ate the manna in the wilderness, and they died. This is the bread which comes down out of heaven, that a man may eat thereof, and not die. I am the living bread which came down out of heaven: if any man eat of this bread, he shall live forever.
John 10
But you do not believe because you are not of my sheep. My sheep hear my voice, and I know them, and they follow me: and
I give them eternal life; and they shall never perish, . . . .