It is narrated from Aban bin Uthman (may Allah have mercy on him) that Sayyiduna Uthman bin Affan (may Allah be pleased with him) ate bread and meat, then rinsed his mouth, washed his hands and wiped his face, then prayed but did not perform ablution.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 730