Which caliph of the Muslims ordered the collection of Ahadith of the official level:

Hazrat Umar Bin Abdul Aziz, an Umayyad caliph, ordered the systematic collection of Hadith in the 8th century to preserve Prophetic traditions. Studying this highlights his role in Islamic scholarship, the challenges of authenticating Hadith, and its impact on religious practice. It also offers insights into how early efforts preserved Islamic knowledge, providing lessons on rigorous scholarship for maintaining religious authenticity.