Hadith No: 1
Al-Muttaqi al-Hindi - Kanz al-'Ummal fi Sunan al-Aqwal wal-Af'al
Volume: (11) - Page Number: (618)
33003 - "Blessed be you both! I am the Master of the Children of Adam, and you are the masters of the Arabs," he said this to Ali and al-Abbas.
33006 - "I am the Master of the Children of Adam, and Ali is the Master of the Arabs."

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 11

Hadith No: 2
Al-Muttaqi al-Hindi - Kanz al-‘Ummal fi Sunan al-Aqwal wal-Af'al
Volume: (11) - Page Number: (619/620)
33008 - O Aisha, if you wish to see the master of the Arabs, then look at Ali ibn Abi Talib. She said, "O Prophet of Allah, are you not the master of the Arabs?" He replied, "I am the Imam of the Muslims and the master of the righteous. If you wish to see the master of the Arabs, then look at the master of the Arabs."
33009 - Welcome to the master of the Muslims and the Imam of the righteous, which he said to Ali.
33011 - On the night I was taken on the Night Journey, I passed by my Lord, Mighty and Majestic be He, who revealed to me three things about Ali: that he is the master of the Muslims, the guardian of the righteous, and the leader of those with shining foreheads and limbs.

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 11

Hadith No: 3
Al-Muttaqi al-Hindi - Kanz al-Amal fi Sunan al-Aqwal wa al-Afal
Volume: (13) - Page Number: (177)
36527 - Also: From al-Sha'bi who said: The Messenger of Allah(peace be upon him and his holy progeny)said to me: Welcome to the leader of the Muslims and the Imam of the God-fearing, it was said to Ali. What was your gratitude? He replied: I praised Allah for what He had given me, I asked Him for gratitude for what He had bestowed upon me, and for Him to increase me from what He had granted me.

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Reference: Kanz al-Ummaal fi Sunan al-Aqwaal wa al-Af'aal Book 13