Sahih Bukhari | Volume 9 | Hadith Number 510

Narrated by 'Abdullah
A Jew came to the Prophet and said, "O Muhammad! Allah will hold the heavens on a Finger, and the mountains on a Finger, and the trees on a Finger, and all the creation on a Finger, and then He will say, 'I am the King.' " On that Allah's Apostle smiled till his premolar teeth became visible, and then recited:

'No just estimate have they made of Allah such as due to him... (39:67) 'Abdullah added: Allah's Apostle smiled (at the Jew's statement) expressing his wonder and believe in what was said.