In the Science of Hadith, Dirayah is also referred to as `Uloom al-Hadith, Mustalah al-Hadith, and Usool al-Hadith.

What is Sunnah? To the scholars of Hadith, the Sunnah is all that has been known of the statements, actions, approvals, physical descriptions, characteristics, and life-story (seerah) of Prophet Muhammad (may the peace and blessings of Allah be upon him), whether before or after revelation. In this sense, Sunnah is synonymous to Prophetic Hadith (Hadith Nabawi).

After starting with some basic definitions, discussing why Sunnah is a source of legislation, summarizing the teaching methodology of our beloved Prophet (may the peace and blessings of Allah be upon him), looking into the spread of hadith during his time, and then during the time of the companions and their followers, we finally come to answering a critical question: how and when was hadith written down (or preserved in writing)?

As with the previous parts, this post will not provide an exhaustive study, but rather present highlights based on Dr. Muhammad Ajaj Al Khatib�s book, Usool al-Hadith

To give a quick summary, hadith was written down individually as early as the time of the Prophet (peace be upon him), and continued to be transmitted in writing (as well as verbally).  However, the first formal order by a khalifah (caliph) to collect Hadith in writing was at the turn of the second century (after hijrah) during the time of `Umar ibn `Abdul-`Aziz.

Part of the confusion regarding the writing of hadith is due to the presence of conflicting ahadeeth on this matter.  There are authentic narrations that prohibit the writing of hadith and others that encourage it.

For example, there is an authentic hadith narrated by Abu Sa`eed al-Khudariy in Sahih Muslim, in which the Prophet (peace be upon him) clearly prohibits the writing of hadith and orders the companions who wrote any words from him other than Qura�n to erase them.

To reconcile the above ahadith (and others like them), scholars have provided the following explanations:

Prophet Muhammad (peace be upon him) prohibited the writing of Hadith during the early days of Islam to avoid confusion between Hadith and Qur�an.

Around 100 A.H., the fifth righteous Caliph, `Umar ibn `Abdul-`Aziz, formally ordered the collection of hadith.  `Umar feared the loss and distortion of hadith due to the death of many of the companions, and also the new phenomenon of fabricated ahadith�which began in that time due to political and sectarian disputes.

Shortly after that, many scholars began classifying ahadith based on their chain of narration or topic.  As such, the turn of the second hijri century was not the beginning of the collection and preservation of hadith, but the beginning of its classification.

As for the earliest examples of written ahadith, the most famous is as-Sahifah as-Sadiqah (The Truthful Scroll) of `Abdullah ibn `Amr ibn al-`Aas, which included a thousand hadith (according to ibn al-Athir) that `Abdullah ibn Amr wrote directly from the Prophet of Allah (peace be upon him).  This document was cherished by `Abdullah ibn `Amr and it was passed on to his family after his death.

May Allah (swt) reward all the great scholars who have dedicated their lives to the collection and teaching of the ahadith of Prophet Muhammad (peace be upon him), and give us the honor of being of those who studied, understood, and applied his teachings