John 3:2-7 CSB
This man came to him at night and said, “Rabbi, we know that you are a teacher who has come from God, for no one could perform these signs you do unless God were with him.” Jesus replied, “Truly I tell you, unless someone is born again, he cannot see the kingdom of God.” “How can anyone be born when he is old?” Nicodemus asked him. “Can he enter his mother’s womb a second time and be born?” Jesus answered, “Truly I tell you, unless someone is born of water and the Spirit, he cannot enter the kingdom of God. Whatever is born of the flesh is flesh, and whatever is born of the Spirit is spirit. Do not be amazed that I told you that you must be born again.