It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) asked: "Who is the chief of the Arabs?" The Companions said: "You are, O Messenger of Allah." He (peace and blessings be upon him) said: "I am the chief of the children of Adam, while Sayyiduna Ali (may Allah be pleased with him) is the chief of the Arabs."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Humayd (may Allah have mercy on him) except Khaqan (may Allah have mercy on him), and no one from Khaqan (may Allah have mercy on him) except Umar bin Abd al-Aziz (may Allah have mercy on him), while Ubaydullah al-Jubayri (may Allah have mercy on him) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 1468
Hadith Gradingمحدثین:إسناده ضعيف لضعف خاقان بن عبد الله بن الأهتم
Hadith Takhrij«قال الهيثمي: فيه خاقان بن عبد الله بن الأهتم ضعفه أبو داود «مجمع الزوائد ومنبع الفوائد، ج 9، ص 116»»