It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that Abu Bakr al-Siddiq and Umar bin al-Khattab (may Allah be pleased with them both) ate bread and meat, then prayed but did not perform ablution.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 729