Chapter 1: Purification (Kitab Al-Taharah)

Narrated Abu Hurayrah: The Prophet (ﷺ) said: The following verse was revealed in connection with the people of Quba': "In it are men who love to be purified" (ix.108). He (Abu Hurayrah) said: They used to cleanse themselves with water after easing. So the verse was revealed in connection with them.
Sunan Abi Dawud 44
Chapters
1 Purification (Kitab Al-Taharah) 2 Prayer (Kitab Al-Salat) 3 The Book Of The Prayer For Rain (Kitab al-Istisqa') 4 Prayer (Kitab Al-Salat): Detailed Rules of Law about the Prayer during Journey 5 Prayer (Kitab Al-Salat): Voluntary Prayers 6 Prayer (Kitab Al-Salat): Detailed Injunctions about Ramadan 7 Prayer (Kitab Al-Salat): Prostration while reciting the Qur'an 8 Prayer (Kitab Al-Salat): Detailed Injunctions about Witr 9 Zakat (Kitab Al-Zakat) 10 The Book of Lost and Found Items 11 The Rites of Hajj (Kitab Al-Manasik Wa'l-Hajj) 12 Marriage (Kitab Al-Nikah) 13 Divorce (Kitab Al-Talaq) 14 Fasting (Kitab Al-Siyam) 15 Jihad (Kitab Al-Jihad) 16 Sacrifice (Kitab Al-Dahaya) 17 Game (Kitab Al-Said) 18 Wills (Kitab Al-Wasaya) 19 Shares of Inheritance (Kitab Al-Fara'id) 20 Tribute, Spoils, and Rulership (Kitab Al-Kharaj, Wal-Fai' Wal-Imarah) 21 Funerals (Kitab Al-Jana'iz) 22 Oaths and Vows (Kitab Al-Aiman Wa Al-Nudhur) 23 Commercial Transactions (Kitab Al-Buyu) 24 Wages (Kitab Al-Ijarah) 25 The Office of the Judge (Kitab Al-Aqdiyah) 26 Knowledge (Kitab Al-Ilm) 27 Drinks (Kitab Al-Ashribah) 28 Foods (Kitab Al-At'imah) 29 Medicine (Kitab Al-Tibb) 30 Divination and Omens (Kitab Al-Kahanah Wa Al-Tatayyur) 31 The Book of Manumission of Slaves 32 Dialects and Readings of the Qur'an (Kitab Al-Huruf Wa Al-Qira'at) 33 Hot Baths (Kitab Al-Hammam) 34 Clothing (Kitab Al-Libas) 35 Combing the Hair (Kitab Al-Tarajjul) 36 Signet-Rings (Kitab Al-Khatam) 37 Trials and Fierce Battles (Kitab Al-Fitan Wa Al-Malahim) 38 The Promised Deliverer (Kitab Al-Mahdi) 39 Battles (Kitab Al-Malahim) 40 Prescribed Punishments (Kitab Al-Hudud) 41 Types of Blood-Wit (Kitab Al-Diyat) 42 Model Behavior of the Prophet (Kitab Al-Sunnah) 43 General Behavior (Kitab Al-Adab)