Musannaf Ibn Abi Shaybah 34131 — Reports on Abu Bakr al-Siddiq

Abdullah bin Salamah (may Allah have mercy on him) said that Sayyiduna Ali (may Allah be pleased with him) said: "Shall I not inform you of the best of this Ummah after the Messenger of Allah (peace and blessings be upon him)? They are Sayyiduna Abu Bakr (may Allah be pleased with him) and Sayyiduna Umar bin al-Khattab (may Allah be pleased with him)."