John 3:9

Then Nicodemus answered by asking, "How can this be?"

But the Jews kept on wrangling with one another and saying, "How can He give us His flesh to eat?"

So many of His disciples, when they heard it, said, "This teaching is hard to take in. Who can listen to it?"

But Mary said to the angel, "How can this be, since I have no husband?"

He looked up and answered, "I see the people, but they look to me like trees moving around."

Nicodemus said to Him, "How can a man be born when he is old? He cannot again enter his mother's womb and be born, can he?"

Treasury of Scripture Knowledge

Nicodemus answered and said unto him, How can these things be?

For everyone who keeps on asking, receives, and everyone who keeps on seeking, finds, and to the one who keeps on knocking, the door will open.

So they kept on asking him, "How in the world did you come to see?"