Sahih Bukhari Volume 6, Book 60, Hadith Number 253.

Narrated By Abu Huraira : Allah’s Apostle said, “On the Day of Resurrection, a huge fat man will come who will not weigh, the weight of the wing of a mosquito in Allah’s Sight.” and then the Prophet added, ‘We shall not give them any weight on the Day of Resurrection ‘ (18.105)