Abu Dawood
The Sunni collection of hadith, called the "Kutub al-Sittah" (six major hadith collections), includes: "Sahih al-Bukhari", "Sahih Muslim", "Sunan Abu Dawood", "Al-Sunan al-Sughra", "Jami` at-Tirmidhi" and "Sunan ibn Majah". "Sahih al-Bukhari" and "Sahih Muslim" are considered the most reliable of these collections.