Here are a few passages and there are more really. But I think these are enough for now.
"And the testimony is this, that God has given us eternal life, and this life is in His Son."
– 1 John 5:11
"Truly, truly, 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 5:24
"For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish, but have eternal life."
– John 3:16
"I am the living bread that came down out of heaven; if anyone eats of this bread, he will live forever; and the bread also which I will give for the life of the world is My flesh."
– John 6:51
"And we know that the Son of God has come, and has given us understanding so that we may know Him who is true; and we are in Him who is true, in His Son Jesus Christ. This is the true God and eternal life."
– 1 John 5:20