It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) asked the Companions: "Which of you will accept my guardianship and loyalty in this world and the Hereafter?" He (peace and blessings be upon him) asked each one of them individually: "Do you accept to be my wali in this world and the Hereafter?" and each declined, until he (peace and blessings be upon him) had passed by most of them. Then Sayyiduna Ali (may Allah be pleased with him) said: "I am your wali in this world and the Hereafter," and he (peace and blessings be upon him) said: "You are my wali in this world and the Hereafter." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that he said: "We used to say among ourselves that the greatest judge and decider of cases among the people of Madinah was Sayyiduna Ali bin Abi Talib (may Allah be pleased with him)." This hadith is sahih (authentic) on the condition of Imam Bukhari and Imam Muslim, but they did not record it.

It is narrated from Sayyiduna Ammar bin Yasir (may Allah be pleased with him) that I heard the Messenger of Allah (peace and blessings be upon him) saying to Sayyiduna Ali (may Allah be pleased with him): "O Ali! Glad tidings for the one who loves you and speaks the truth about you, and woe to the one who hates you and lies about you." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.