Hadith of Umar's ban on hadith decision of Muhammad was rescinded later in his ministry. During Umar's reign as Caliph, hadith were in fact being recorded. On the other hand, some sources dispute this account, and claim that it was Umar himself who was the first person to ban hadith collection - a view also upheld by Shias. Certainly during his rule Umar strictly followed the policy of banning the hadith and he prohibited reporting and transmission of hadith altogether. Whenever he sent a group to a city, he would prohibit them from narrating hadith. This ban continued through the caliphate of the Rashidun caliphs into
Introduction to the Science of Hadith chapters, each covering a hadith related issue. The first 33 chapters describe the various technical terms of hadith terminology which describe the conditions of a hadith's authenticity, or acceptability as a basis for Islamic jurisprudence. The following chapters relate to the "isnād", or chain of narration. Next are a series of chapters pertaining to the etiquette to be observed by hadith scholars and manners of transcription. The last chapters describe various issues relating to the narrators of hadith including naming conventions. Ibn al-Ṣalāḥ began the "Introduction" as a series of lectures he dictated to his students in Damascus ending in