Musannaf Ibn Abi Shaybah 34105 — Reports on Abu Bakr al-Siddiq

Al-Sha'bi (may Allah have mercy on him) said that Masruq (may Allah have mercy on him) said: "To love Sayyiduna Abu Bakr (may Allah be pleased with him) and Sayyiduna Umar (may Allah be pleased with him) and to recognize their excellence is part of the Sunnah."