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The Kutub al-Sittah (Arabic: الكتب الستة, romanized: Al-Kutub as-Sittah, lit. 'The six books') are six (originally five) books containing collections of hadith (sayings or acts of the Islamic prophet Muhammad) compiled by six Sunni Muslim scholars in the ninth century CE. They are sometimes referred to as Al-Sihah al-Sittah, which translates as "The Authentic Six". They were first formally grouped and defined by Ibn al-Qaisarani in the 11th century, who added Sunan ibn Majah to the list. Since then, they have enjoyed near-universal acceptance as part of the official canon of Sunni Islam.
Not all Sunni Muslim jurisprudence scholars agree on the addition of Ibn Majah. In particular, the Malikis and Ibn al-Athir consider al-Mawatta' to be the sixth book. The reason for the addition of Ibn Majah's Sunan is that it contains many Hadiths which do not figure in the other five, whereas all the Hadiths in the Muwatta' figure in the other Sahih books.
- Sahih Bukhari, collected by Imam Bukhari (d. 256 AH, 870 CE), includes 7,275 ahadith
- Sahih Muslim, collected by Muslim b. al-Hajjaj (d. 261 AH, 875 CE), includes 9,200 ahadith
- Sunan Abu Dawood, collected by Abu Dawood (d. 275 AH, 888 CE), includes 4,800 ahadith
- Jami al-Tirmidhi, collected by al-Tirmidhi (d. 279 AH, 892 CE), includes 3,956 ahadith
- Sunan al-Sughra, collected by al-Nasa'i (d. 303 AH, 915 CE), includes 5,270 ahadith
- Sunan ibn Majah, collected by Ibn Majah (d. 273 AH, 887 CE), over 4,000 ahadith
- Muwatta Malik, collected by Imam Malik (d. 179 AH, 795 CE), 1,720 ahadith 
The first two, commonly referred to as the Two Sahihs as an indication of their authenticity, contain approximately seven thousand hadiths altogether if repetitions are not counted, according to Ibn Hajar.
According to the Cambridge History of Iran: "After this period commences the age of the authors of the six canonical collections of Sunni hadith, all of whom were Persian, except Imam Malik. The authors of the six collections are as follows:
- Muhammad b. Isma'il al-Bukhari, the author of the Sahih Bukhari, which he composed over a period of sixteen years. Traditional sources quote Bukhari as saying that he did not record any hadith before performing ablution and praying. Bukhari died near Samarqand in 256/869–70
- Muslim b. Hajjaj al-Naishapuri, who died in Nishapur in 261/874–5 and whose Sahih Muslim is second in authenticity only to that of Bukhari. Some scholars rate the authenticity of Sahih Muslim more than Sahih Bukhari
- Abu Dawood Sulaiman b. Ash'ath al-Sijistani, a Persian but of Arab descent, who died in 275/888–9.
- Muhammad b. 'Isa al-Tirmidhi, the author of the well-known as Sunan al-Tirmidhi, who was a student of Bukhari and died in 279/892–3.
- Abu 'Abd al-Rahman al-Nasa'i, who was from Khurasan and died in 303/915–16.
- Ibn Majah al-Qazwini, who died in 273/886–7.
- Malik was born the son of Anas ibn Malik (not the Sahabi) and Aaliyah bint Shurayk al-Azdiyya in Medina circa 711. His family was originally from the al-Asbahi tribe of Yemen, but his great grandfather Abu 'Amir relocated the family to Medina after converting to Islam in the second year of the Hijri calendar, or 623 CE. According to Al-Muwatta, he was tall, heavyset, imposing of stature, very fair, with white hair and beard but bald, with a huge beard and blue eyes. In chronological order his work was compiled even earlier than Sahih Bukhari, therefore Al-Muwatta is highly regarded in Islamic literature.
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