Yahya related to me from Malik that both Muhammad ibn al-Munkadirand Safwan ibn Sulaym transmitted to him from Muhammad ibn Ibrahim ibnal-Harith at-Taymi from Rabia ibn Abdullah ibn al-Hudayr that he hadeaten an evening meal with Umar ibn al-Khattab who then prayed withoutdoing wudu.
USC-MSA web (English) reference: Book 2, Hadith 21
Arabic reference: Book 2, Hadith 51