John 3:3-6

³Jesus answered and said to him, “Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God.”

⁴Nicodemus said to Him, “How can a man be born when he is old? He cannot enter a second time into his mother’s womb and be born, can he?” ⁵Jesus answered, “Truly, truly, I say to you, unless one is born of water and the Spirit he cannot enter into the kingdom of God. ⁶That which is born of the flesh is flesh, and that which is born of the Spirit is spirit.