Sahih Al Bukhari Hadith Number 730

Narrated `Aisha: The Prophet (peace be upon him) had a mat which he used to spread during the day and use as a curtain at night. So a number of people gathered at night facing it and prayed behind him.

10  Call to Prayers (Adhaan)
Hadith number 730
Volume no 1
Chapter: 81 (The night prayer.)