Virtues of the Prayer Hall (Sutra of the Musalla)
Bukhari :: Book 1 :: Volume 9 :: Hadith 473
Narrated Ibn 'Umar:
Whenever Allah's Apostle came out on 'Id day, he used to order that a Harba (a short spear) to be planted in front of him (as a Sutra for his prayer) and then he used to pray facing it with the people behind him and used to do the same while on a journey. After the Prophet , this practice was adopted by the Muslim rulers (who followed his traditions).
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