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What are the "True Six" or "Authentic Six" (صحيح ستة)?
The Authentic Six are six books containing collections of hadith compiled by six Sunni Muslim scholars in the ninth century CE:
1. Sahih Bukhari, collected by Imam Bukhari
2. Sahih Muslim, collected by Muslim
3. Sunan Abu Dawood, collected by Abu Dawood
4. Jami al-Tirmidhi, collected by al-Tirmidhi
5. Sunan al-Sughra, collected by al-Nasa'i
6. Sunan ibn Majah, collected by Ibn Majah