Hadith No: 1
Al-Mufiq al-Khwarizmi - al-Manaqab
Volume: (1) - Page Number: (295)
287 - And with this chain of narration from the Messenger of Allah (peace be upon him and his holy progeny) that he said: "O Ali, you are the lord of the Muslims, the Imam of the righteous, the leader of those with shining foreheads, and the guardian of the faith."

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Reference: Manaqib Book 1

Hadith No: 2
Al-Mu'waffaq al-Khwarizmi - al-Manaqib
Volume: (1) - Page Number: (328)
340 - And in al-Tabarani's Mu'jam with his chain of narration to Abdullah ibn Alaym al-Juhani, who said: The Messenger of Allah said, "It was revealed to me about Ali three things on the night I was taken on the Isra: He is the leader of the believers, the imam of the pious, and the commander of those with radiant foreheads and limbs."

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Reference: Manaqib Book 1