John 3:2-4

²This man came to Jesus by night, and said to Him, “Rabbi, we know that You have come from God as a teacher, for no one can do these signs that You do unless God is with him.”

³Jesus answered and told him, “Most assuredly, I tell you, unless one is born again, that person can’t see the kingdom of God.”

⁴Nicodemus asked Him, “How can a man be born when he is old? He can’t go back into his mother’s womb and be born, can he?”