Hadith of Umar's ban on hadith decision of Muhammad was rescinded later in his ministry.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 adding six terms in the process). The first pertains to the "matn" (text) of the hadith and its three divisions and 30 types. The three divisions are "ṣaḥīḥ", "ḥasan", and "ḍa`īf". The thirty types include those mentioned in hadith terminology and others. The second deals with the "isnād" (chain of narration) and comprises 11 types. These types generally fall within the discipline of biographical evaluation. The third category includes six types: the qualifications necessary for conveying hadith, the manners in which they are transmitted, the transcription of hadith, and the etiquette of the narrator and of the student. The fourth