Silsilat al-Ahadith al-Sahihah

The Messenger of Allah (peace and blessings be upon him) said: "Abu Bakr and Umar are the leaders of the mature people who will enter Paradise from the first and the last (of mankind)." This hadith is narrated from a group of the Companions, such as: Sayyiduna Ali bin Abi Talib, Sayyiduna Anas bin Malik, Sayyiduna Abu Juhaifah, Sayyiduna Jabir bin Abdullah, and Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with them).