Hadith No: 1
Al-Bayhaqi - Ma'rifat al-Sunan wa'l-Athar - Book of Reviving the Dead Land - The Status of a Child with His Parents in Religion
Volume: (9) Page Number: (94)
12476 - Ahmad said: Abu Bakr ibn Furk narrated to us, saying: Abdullah ibn Ja'far narrated to us, saying: Yunus ibn Habib narrated to us, saying: Shu'bah narrated to us, saying: Amr ibn Murrah informed me, from Abu Hamzah from Zayd ibn Arqam, who said: "The first to pray with the Prophet (peace be upon him and his holy progeny) was Ali ibn Abi Talib."
12478 - And we have seen a young child observing the prayer and performing it, unaware that he is required to pray and ignorant of faith. Thus, Ali's (peace be upon him) situation was that he was the first to pray, for he saw the Prophet (peace be upon him and his holy progeny) and Khadijah praying, so he acted as they did, just as a child sees his parents praying and prays with them, not understanding the obligation of prayer or faith. It has not been reported to us that the Messenger of Allah (peace be upon him and his holy progeny) judged Ali differently than he judged his parents before Ali reached maturity.
12479 - Ahmad said: It has been said that he embraced Islam when he was too young to reach maturity, as he was in many narrations ten years old or older.
12480 - Al-Hasan al-Basri said: Ali embraced Islam when he was fifteen or sixteen years old.

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Reference: Ma'refah al-Sunan Wa Al-Aasaar Book 9

Hadith No: 2
Al-Bayhaqi - Sunan al-Kubra - Book of Lost Property - Chapter on Those Who Say: His Islam Can Be Deemed Valid
Volume: (6) Page Number: (339)
12158 - Abu al-Hasan Ali ibn Ahmad ibn Abdan narrated to us, saying: Ahmad ibn Ubayd al-Saffar narrated to us, saying: Muhammad ibn al-Farj al-Azraq narrated to us, from Abu al-Nadr, from Shu'bah from Amr ibn Murrah, who told me that he heard Abu Hamzah, a man from the Ansar, say that he heard Zayd ibn Arqam say: "The first to pray with the Prophet (peace be upon him and his holy progeny) was Ali ibn Abi Talib." I mentioned this to Ibrahim, and he denied it, saying: "It was Abu Bakr."

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Reference: Al-Sunan al-Kubra Book 6

Hadith No: 3
Al-Bayhaqi - Sunan al-Kubra - Book of the Foundling (Luqata) - Chapter on Those Who Say: His Islam May Be Deemed Valid
Volume: (6) Page Number: (339)
12159 - Abu Abdullah al-Hafiz narrated to us, saying: Abu Bakr ibn Ishaq al-Faqih narrated to us, saying: Muhammad ibn Yunus narrated to us. And Ali ibn Ahmad ibn Abdan narrated to us, saying: Ahmad ibn Ubaid narrated to us. Muhammad ibn Yunus also narrated to us, saying: Ibrahim ibn Zakariya al-Bazzaz narrated to us, saying: Musa ibn Muhammad ibn Ata al-Maqdisi narrated to me, from Abu Abdullah al-Shami about al-Najib ibn al-Sari, who said: Ali (may peace be upon him and him) said in a narration he mentioned: "I preceded them in embracing Islam, a foot (or a step), as a boy, before I had reached the age of maturity." There is no mention of "a foot" in Ibn Abdan's narration, and this is commonly known among people as a statement of Ali (may peace be upon him and him), although it has not reached us with a chain of narration that can be regarded as reliable. The scholars have differed regarding his age on the day he accepted Islam.

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Reference: Al-Sunan al-Kubra Book 6

Hadith No: 4
Al-Bayhaqi - Sunan al-Kubra - Book of the Lost Item (Luqata) - Chapter on Those Who Say: His Islam Should Be Considered Valid
Volume: (6) Page Number: (339)
12160 - Abu al-Husayn ibn al-Fadl al-Qattan narrated to us in Baghdad, saying: Abdullah ibn Ja'far narrated to us, saying: Ya'qub ibn Sufyan narrated to us, saying: Yahya ibn Abdullah ibn Bakir narrated to me that al-Layth ibn Sa'd narrated to me that Abu al-Aswad from Urwa said: Ali (may Allah be pleased with him and him) accepted Islam when he was eight years old.

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Reference: Al-Sunan al-Kubra Book 6

Hadith No: 5
Al-Bayhaqi - Sunan al-Kubra - Book of the Forgotten Property (Luqata) - Chapter on Those Who Say: His Islam is to be Considered Valid
Volume: (6) Page Number: (339)
12161 - Abu Abdullah al-Hafiz narrated to us, from memory, saying: Abu al-Abbas Muhammad ibn Ya'qub narrated to us, saying: Ahmad ibn Abdul Jabbar narrated to us, saying: Yunus ibn Bakir narrated to us, from Muhammad ibn Ishaq, that Ali ibn Abi Talib (may Allah be pleased with him) embraced Islam when he was ten years old.

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Reference: Al-Sunan al-Kubra Book 6

Hadith No: 6
Al-Bayhaqi - Sunan al-Kubra - Book of Lost Property - Chapter on Those Who Said: His Islam Can Be Considered Valid
Volume: (6) Page Number: (339)
12162 - Abu Abdullah narrated to us in al-Maghazi, saying: Abu al-Abbas al-Asamm narrated to us, saying: Ahmad narrated to us, saying: Yunus narrated to me, from Abdullah ibn Abi Najih, who said: I believe he narrated to me from Mujahid, who said: Ali ibn Abi Talib (peace be upon him and his holy progeny) embraced Islam when he was ten years old.

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Reference: Al-Sunan al-Kubra Book 6

Hadith No: 7
Al-Bayhaqi - al-Sunan al-Kubra - Book of Lost Property (al-Luqatah) - Chapter on Those Who Say: His Islam Should Be Considered Valid
Volume: (6) Page Number: (339)
12163 - Abu Tahir the Faqih narrated to us, saying: Abu عثمان al-Basri narrated to us, who said: Muhammad ibn Abd al-Wahhab narrated to us, saying: I heard al-Husayn ibn al-Walid say: I heard Sharīk say: Ali (peace be upon him) accepted Islam when he was eleven years old.

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Reference: Al-Sunan al-Kubra Book 6

Hadith No: 8
Al-Bayhaqi - Sunan al-Kubra - Book of Lost Property - Chapter on Those Who Say: His Islam Can Be Considered Valid
Volume: (6) Page Number: (340)
12164 - Abu al-Husayn ibn Bishran narrated to us, saying: Isa ibn Muhammad al-Saffar narrated to us, mentioning Ahmad ibn Mansur, and Abu al-Husayn ibn al-Fadl al-Qattan narrated to us, saying: Abdullah ibn Ja'far narrated to us, mentioning Jacob ibn Sufyan, who said: Isa ibn Muhammad and Abu Bashar both said: Abd al-Razzaq narrated to us, mentioning Ma'mar, from Qatadah, from al-Hasan and others, that the first to believe in him was Ali ibn Abi Talib, who was fifteen or sixteen years old at the time. The wording of their hadith is similar, and in the narration of Ahmad ibn Mansur, it is said: from al-Hasan and several others, that the first to embrace Islam was Ali, after Khadijah (may she be in peace), who was fifteen or sixteen years old.

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Reference: Al-Sunan al-Kubra Book 6

Hadith No: 9
Al-Bayhaqi - Sunan al-Sughra - Book of Transactions - Chapter on a Child Following His Parents in Religion as Long as He Does Not Reach Maturity
Volume: (2) Page Number: (349)
1764 - Abu al-Husayn ibn Bishran narrated to us in the Jami' of Abd al-Razzaq, saying: Isma'il ibn Muhammad al-Saffar narrated to us, saying: Ahmad ibn Mansur narrated to us, saying: Abd al-Razzaq narrated to us, from Ma'mar, from Qatadah from al-Hasan and several others, who said: "The first to accept Islam from Ali after Khadijah was him, at the age of fifteen or sixteen years."

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Reference: Sunan al Sughra Book 2