What are the sound, verified books in Fiqh?

Answer Summary:

The approved books in each of the four schools of thought are as follows:

Hanafi: "Kanz al-Daqaiq" by Al-Nasafi, "Al-Mukhtar" by Al-Mawsili, "Matn al-Quduri". Maliki: "Al-Risala" by Ibn Abi Zayd, "Al-Kafi" by Ibn Abd al-Barr, "Mukhtasar Khalil" (with its approved commentaries such as "Al-Sharh al-Kabir li al-Dardir" and "Hashiyat al-Dasuqi"). Shafi'i: "Nihayat al-Muhtaj" by Al-Ramli, "Tuhfat al-Muhtaj" by Ibn Hajar al-Haytami. The relied-upon text for teaching is "Matn Abi Shuja'". Hanbali: "Al-Insaf" by Al-Mardawi, "Al-Iqna'" by Al-Hajjawi and its commentary "Kashshaf al-Qina'" by Al-Buhuti, "Muntaha al-Iradat" by Ibn al-Najjar and its commentary by Al-Buhuti. The relied-upon text for teaching is "Zad al-Mustaqni'" by Al-Hajjawi and its commentary "Al-Rawd al-Murbi'" by Al-Buhuti.