John 3:4

3:4 Nicodemus said to him, “How can a man be born when he is old? He cannot enter his mother’s womb and be born a second time, can he?” ¹ 

John 6:42

6:42 and they said, “Isn’t this Jesus the son of Joseph, whose father and mother we know? How can he now say, ‘I have come down from heaven’?”

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¹ tn The grammatical structure of the question in Greek presupposes a negative reply.