Silsilat al-Ahadith al-Sahihah

The Messenger of Allah (peace and blessings be upon him) said: "After me, follow Abu Bakr and Umar, adopt the way of Ammar, and hold fast to the covenant of Ibn Mas'ud." This hadith is narrated from Sayyiduna Abdullah bin Mas'ud, Sayyiduna Hudhaifah bin al-Yaman, Sayyiduna Anas bin Malik, and Sayyiduna Abdullah bin Umar (may Allah be pleased with them).