Sahih Bukhari
To make the Heart Tender (Ar-Riqaq)
Volume: 008 / Book Number: 076 / Hadith Number: 528
Narrated Sahl bin Sa'd:
I heard the Prophet saying, "The people will be gathered on the Day of Resurrection on reddish white land like a pure loaf of bread (made of pure fine flour)." Sahl added: That land will have no landmarks for anybody (to make use of).