John 3:3

Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot see the kingdom of God.

John 3:7

Marvel not that I said unto thee, Ye must be born again.

1 Peter 1:23

Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth for ever.