Re: Compilation of Quran vs Hadith

Sorry for the late reply but I actually had to hit my books for composing a further reply. This is not information you can find in cyberspace. You can only extract such information from historical scholarly text. Just to let yo know I have extracted this information from the Muwatta of Imam Muhammad, who produced the edited form of the Muwatta of Malik as he as his student.
Anyways, one thing which has not been formally liad out here is that verification of prophetic reports used to occur even among the Sahaba RA. Though it has not been recorded as being the formal procedures which can now be found in the science of validation. There are reports of when Abu Bakr RA, Umar bin Khattab RA, Ali RA and Aisha RA have resorted to verification of reports or reiteration of them at times. Now one thing that did not happen when the Sahabs narrated amongst each other regarding the Sunnah of the Prophet SAW was verification of the isnad mainly because every one of the Sahabs were trustworthy during the time of the Prophet SAW adn they did not lie to each other. Just to give you an example would when Aisha RA had corrected one of the reports from Umar RA regarding the wailing of a family upon their dead. Paraphrasing, Umar RA has said that Allah SWT increases the torment of a person due to the wailing of his family. Aisha RA had corrected this report by specifying that the Prophet SAW had said that the torment of a kafir is increasing due to the wailing of his family, this does not happen for a momin. Aisha RA had further stated that Umar RA mistake was not deliberate.
The science of hadith originated in Madinah and rightly so because most the knowledgible people about Islam lived in Madinah until the Fitnah started and then some companions migrated to other countries. Some relocated due to the expansion of the Islamic empire.
The first instance where people became conscious about falsification of hadith was during the fitnah in which Uthman RA was murdered. From this piont in our history people started segregating who the hadith reports came from and they would ask for the isnad in order to verify whether the report comes from trustworthy companions or not. So the ground rules for the science of verification came to existence sometime during the later half of the first century of Islam. Though the practice had been exercised by the Prophet SAW closest companions when necessary however there was no widespread need for it. It never became a problem till later on after the fitnah.
The followers of the first generation of companions formally introduced the earlier procedures which had been adapted by Abu Bakr RA, Umar RA and Ali RA for verification if need be and expanded on them. Al these people belonged to Madinah. They are called Sadat. A short list of them is:
Sa’id ibn AL Musayyab (d. 94AH)
Al Qasim ibn Muhammad ibn Abu Bakr (d. 104AH)
Salim ibn Abdullah ibn Umar (d. 104AH)
Ali ibn al Husayn ibn Ali (d. 93AH)
Abu Salma ibn Abd ar Rahman ibn Awf (d. 94AH)
Ubaydullah ibn Abdullah ibn Utbah (d. 94AH)
Kharijah ibn Zayd ibn Thabit (d. 100AH)
Urwah ibn Az Zubayr ibn Awwam (d. 94AH)
Abu Bakr ibn Abd ar Rahman ibn Harith ibn Hisham (d. 94AH)
Sulayman ibn Yasar (d. 100AH)
If you wold but notice these pious people are among the offspring of those who fought side by side with the Prophet SAW and ever from the Prophet SAW family himself.
These people further had disciples among whom some distinguished names are:
Az Zuhri (d. 124AH)
Yahya ibn Sa’id al Ansari (d. 144AH)
HIsahm ibn Urwah (d. 146AH)
Said ibn Ibrahim (d. 146AH)
Among those who spread out to Iraq after Islamic conquests were:
Al Hasan al Basri (d. 110AH)
Tawus (d. 104AH)
Said ibn Jubayr (d. 94AH)
Ibrahim an Nakhai (d. 96AH)
Amir ash Shabi (d. 105AH)
Ibn Sirin (d. 110AH)
You can see from these Tabiun the roots of hadith verification took hold in Iraq, which eventually evolved into a powerhouse research center for hadith after Madinah. Those who go on to discredit Iraqi scholars of hadith never bother to pursue the trail of men who came with hadith to Iraq. Things did not spring out of Iraq with some disconnect.
Further distinguished muhaddiths in Iraq to learn from the above group were:
Ayyub as Sakhtiyani (d. 131AH)
Ibn Awn (d. 150AH)
The next generation of muhadddiths were less confined to their regions but traveled extensively throughout the Islamic empire. Among them are:
Sufyan ibn Said ath Thawri (d. 162AH)
Malik ibn Anas (d. 179AH)
Shubbah ibn al Hajjaj (d. 160AH - from central region, I believe central Asian)
Abd ar Rahman ibn Amr al Awzai (d. 156AH - from Beirut)
Hammad ibn Salamah (d. 176AH - from Basra)
Al Layth ibn Sad (d. 175AH - from Egypt)
Hammad ibn Zayd (d. 179AH - from Makkah)
Sufyan ibn Uyaynah (d. 198AH - from Makkah)
As one can see things regarding the science of hadith did not evolve in a vaccum but throughout the Islamic empire. The next generation of muhaddiths were:
Abdullah ibn Mubarak (d. 181AH)
Yahya ibn Said al Qattan (d. 198AH)
Waki ibn al Jarrah (d. 197AH)
Abd ar Rahman ibn Fahdi (d. 198AH)
Muhammad ibn Idris ash Shafi’i (d. 204AH)
Next come the generations where these works started to culminate in the codified hadith books we have today. Some people who further extended the efforts from their predecessors are:
Ahmad ibn Hanbal (d. 240AH)
Yahya ibn Main (d. 233AH)
Ali ibn Madani (d. 234AH)
Abu Bakr ibn Abi Shaybah (d. 235AH)
Ishaq ibn Ibrahim al Hanzali (d. 238AH)
Ubaydullah ibn Umar Al Qawariri (d. 235AH)
Zauhayr ibn Harb Abu Khaythamah (d. 234AH)
Then those who produced the popular works we know today:
Muhammad ibn Yahya adh Dhahli (d. 258AH)
Ubaydullah ibn Abd ar Rahman ad Darimi (d. 255AH)
Abu Zurah ar Razi (d .263AH)
Muhammad ibn Ismail al Bukhari (d. 256AH)
Muslim ibn al Hajjaj (d. 161AH)
Abu Dawud as Sijistani (d. 275AH)
Most of the work of the earlier 2 generation of muhaddiths is no longer extant but only found referenced in works of other people of historical accounts. However one can clearly see the time trail of people meticuously devoting themselves to the science of hadith as opposed to those who thikn it just all started centuries later and use that as an excuse to discredit hadith. There are many more names but the ones given in my reply are those which are more highlighted in historical reference and work on rijal material from my understanding.