"The first to perform Salat was 'Ali."
Jami` at-Tirmidhi Book 49, Hadith 131
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from his father, from his grandfather, 'Ali bin Abi Talib: "The Prophet (ﷺ) took Hasan and Husain by the hand and said: 'Whoever loves me and loves these two, and their father and mother, he shall be with me in my level on the Day of Judgement."
Jami` at-Tirmidhi Book 49, Hadith 130 Next Hadith → that Zaid bin Al-Arqam said: "The first to accept Islam was 'Ali." 'Amr bin Murrah said: "So I mentioned that to Ibrahim An-Nakha'i, so he rejected that and said: 'The first to accept Islam was Abu Bakr As-Siddiq.'"
Jami` at-Tirmidhi Book 49, Hadith 132
Jami` at-Tirmidhi Book 49, Hadith 130 Next Hadith → that Zaid bin Al-Arqam said: "The first to accept Islam was 'Ali." 'Amr bin Murrah said: "So I mentioned that to Ibrahim An-Nakha'i, so he rejected that and said: 'The first to accept Islam was Abu Bakr As-Siddiq.'"
Jami` at-Tirmidhi Book 49, Hadith 132