The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1016
'Aun b. Abu Juhaifa narrated from the Apostle of Allah (may peace be upon him) on the authority of his father a hadith like that of Sufyan, and 'Umar b. Abu Za'ida made this addition: Some of them tried to excel the others (in obtaining water), and in the hadith transmitted by Malik b. Mighwal (the words are): When it was noon, Bilal came out and summoned (people) to (noon) prayer.