John 3:2-4

the same came unto him by night, and said to him, Rabbi, we know that thou art a teacher come from God; for no one can do these signs that thou doest, except God be with him. Jesus answered and said unto him, Verily, verily, I say unto thee, Except one be born anew, he cannot see the kingdom of God. Nicodemus saith unto him, How can a man be born when he is old? can he enter a second time into his mother’s womb, and be born?