Hadith Compilation

Abu Abdullah Muhammad ibn Yazid ibn Majah (824–887 CE) compiled Sunan Ibn Majah, the sixth and most debated of the six canonical Sunni hadith collections. It is noted for its broad coverage and many unique traditions, though it includes more weak and disputed reports than the others.

Abu Dawood Sulaiman ibn al-Ash'ath (817–889 CE) was one of the six canonical hadith scholars of Sunni Islam. His Sunan Abu Dawood, distilled to about 4,800 hadith, was the first major collection organized around Islamic legal topics, becoming an essential reference for jurists.

Umar ibn Abd al-Aziz (c. 680-720 CE), the eighth Umayyad caliph, ruled about two and a half years and used them to attempt a thorough reform of the state: equalising the tax status of converts, halting expansion, restoring seized property, and ordering hadith to be collected in writing.