Maliks Muwatta Book 2, Hadith Number 22.
Section : Discontinuing Doing Wudu on Account of Eating Cooked Food.
Yahya related to me from Malik from Damra ibn Said al-Mazini from Aban ibn Uthman that Uthman ibn Affan ate bread and meat, rinsed his mouth out, washed his hands and wiped his face with them, and then prayed without doing wudu.