Yahya related to me from Malik from Ibn Shihab from Salim ibnAbdullah that Umar ibn al-Khattab turned people back at Sarghaccording to the hadith of Abd ar-Rahman ibn Awf. (FR)
USC-MSA web (English) reference: Book 45, Hadith 25 (FR)
Arabic reference (FR): Book 45, Hadith 1624 (FR)