Silsilat al-Ahadith al-Sahihah

The Messenger of Allah (peace and blessings be upon him) said: "Follow Abu Bakr and Umar after me, 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 Hudhayfah bin Yaman, Sayyiduna Anas bin Malik, and Sayyiduna Abdullah bin Umar (may Allah be pleased with them).