Sahih Bukhari Volume 8, Book 76, Hadith Number 527.

Narated By Abu Said Al-Khudri : The Prophet said, “The (planet of) earth will be a bread on the Day of Resurrection, and The resistible (Allah) will topple turn it with His Hand like anyone of you topple turns a bread with his hands while (preparing the bread) for a journey, and that bread will be the entertainment for the people of Paradise.” A man from the Jews came (to the Prophet) and said, “May The Beneficent (Allah) bless you, O Abul Qasim! Shall I tell you of the entertainment of the people of Paradise on the Day of Resurrection?” The Prophet said, “Yes.” The Jew said, “The earth will be a bread,” as the Prophet had said. Thereupon the Prophet looked at us and smiled till his premolar tooth became visible. Then the Jew further said, “Shall I tell you of the udm (additional food taken with bread) they will have with the bread?” He added, “That will be Balam and Nun.” The people asked, “What is that?” He said, “It is an ox and a fish, and seventy thousand people will eat of the caudate lobe (i.e. extra lobe) of their livers.”