Jesus answered and said unto him, Verily, verily, I say unto thee, Except a man be born again, he cannot enter the kingdom of God. Nicodemus saith unto Him, How can a man be born when he is old? can he enter the second time into his mother's womb and be born? Jesus answered, Verily, verily I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God. That which is born of the flesh is flesh; and that which is born of the Spirit is spirit. Marvel not that I said unto thee, Ye must be born again.
(John 3:3-7).
Therefore if any man be in Christ, he is a new creature: old things are passed away; behold all things are become new.
(2 Corinthians 5:17).
For He hath made Him to be sin for us, who knew no sin; that we might be made the righteousness of God in Him.
(2 Corinthians 5:21).
And you hath He quickened, who were dead in trespasses and sins.
(Ephesians 2:1).