Hadith No: 1
Ibn Sa'd - Tabaqat al-Kubra
The first generation following the previous one in Islam among the early emigrants who witnessed Badr ...
Mentioning the Islam of Ali and his prayers
Volume: (3) Page Number: (21)
- He said: Muhammad ibn Umar informed us, saying: Ibrahim ibn Nafi' and Ishaq ibn Hazim informed us from Abu Najih from Mujahid, who said: The first to pray with Ali was when he was ten years old.

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Reference: Al-Tabaqaat al-Kubra Book 3

Hadith No: 2
Ibn Sa'd - Tabaqat al-Kubra
The First Generation of the Predecessors in Islam who witnessed the Battle of Badr among the earliest emigrants...
Mention of Ali's Islam and his prayers
Volume: (3) Page Number: (21)
- He said: Muhammad ibn Umar informed us, saying: Amr ibn Abdullah ibn Utbah narrated to me, from Umara ibn Ghaziyah from Muhammad ibn Abd al-Rahman ibn Zurarah, who said: Ali embraced Islam when he was nine years old.

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Reference: Al-Tabaqaat al-Kubra Book 3

Hadith No: 3
Ibn Sa'd - al-Tabaqat al-Kubra
The First Generation of the Preceders in Islam Who Witnessed Badr from the Early Emigrants...
Mention of Ali's Islam and Prayer
Volume: (3) Page Number: (21)
- He said: Isma'il ibn Abdullah ibn Abi Awfis narrated to us, saying that he heard from al-Hasan ibn Zayd ibn Hasan ibn Ali ibn Abi Talib that Ali ibn Abi Talib, when the Prophet (peace be upon him and his holy progeny) called him to Islam, was nine years old. Al-Hasan ibn Zayd added: And it is said he was younger than nine years, and he never worshiped idols due to his young age.

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Reference: Al-Tabaqaat al-Kubra Book 3

Hadith No: 4
Ibn Sa'd - al-Tabaqat al-Kubra
The first class, as previously mentioned in Islam, of those who witnessed the Battle of Badr among the earliest emigrants ...
Mentioning the Islam of Ali and his prayers
Volume: (3) Page Number: (21)
- He said: Yazid ibn Harun and Sulayman Abu Dawud al-Tiyalisi narrated to us, saying: They said: Shu'bah narrated to us from Salamah ibn Kuhayl from Habbah al-'Arani, who said: I heard Ali say: "I am the first to pray." Yazid added: or to have embraced Islam.

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Reference: Al-Tabaqaat al-Kubra Book 3

Hadith No: 5
Ibn Sa'd - al-Tabaqat al-Kubra
The First Class of the Earlier Companions in Islam Who Attended the Battle of Badr from the Early Emigrants ...
Mentioning the Islam of Ali and his Prayers
Volume: (3) Page Number: (21)
- He said: Yahya ibn Hammad al-Basri narrated to us, saying: Abu 'Awaneq narrated to us, from Abu Balj, from Amr ibn Maymun from Ibn Abbas, who said: "The first to embrace Islam among people after Khadijah was Ali." Muhammad ibn Umar and our companions are unanimous that the first of the people of the qibla to respond to the Messenger of Allah (peace be upon him and his holy progeny) was Khadijah bint Khuwailid. Then, there was disagreement among us regarding three men as to which of them embraced Islam first: Abu Bakr, Ali, and Zayd ibn Harithah. We do not find any accounts of Ali's Islam being authentic except that he was eleven years old at the time.

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Reference: Al-Tabaqaat al-Kubra Book 3