Generally, Aḥādīth are transmitted by the Companions of The Prophet ﷺ, some having more and less than others. Though it may be the case that a Companion accepted Islām before another Companion, it is possible that the Companion who accepted Islām later could carry more Aḥādīth than the one who preceded him, and from the reasons of this and the differing amount of narrations between the Companions are:
- Some held government positions and were dispatched to different lands, resulting in them accompanying The Prophet ﷺ less than others.
- Some were wives of The Prophet ﷺ, which of course gave them the advantage to gather much more Aḥādīth than others, especially in more intricate matters. An example of this is ʿĀʾishah رضي الله عنها.
- Some were from Ahl aṣ-Ṣuffah,1 giving them the oppurtunity to see The Prophet ﷺ continuously. An example of this is Abū Hurayah رضي الله عنه.
- Some lived longer than others, naturally giving them the advantage to surpass the amount of those who passed away before them.
- Some would write Ḥadīth, such as ʿAbdullāh ibn ʿAmr2 رضي الله عنه.
- Some were servants of The Prophet ﷺ, such as Anas ibn Mālik3 رضي الله عنه.
These are only partial reasons. It is also worthy to note that some Companions would hear and narrate Aḥādīth from other Companions.
Abū Hurayah رضي الله عنه (d. 59 AH): narrated 5,374 Aḥādīth. He embraced Islām after the Hijrah.
ʿĀʾishah bint Abū Bakr aṣ-Ṣiddīq رضي الله عنها (d. 58 AH): narrated 2,210 Aḥādīth. She, may Allāh be pleased with her, was younger than her sister Asmā’ and The Prophet ﷺ lived with her after the Hijrah to Madīnah.
ʿAbdullāh ibn ʿUmar رضي الله عنه (d. 83 AH): narrated 1,630 Aḥādīth. He embraced Islām during the early period of Makkah.
Anas ibn Mālik رضي الله عنه (d. 93 AH): narrated 1,286 Aḥādīth. He was the servant of The Prophet ﷺ from the time he came to Madinah up until his death, a length of 10 years. He was from amongst the last of the Companions to die in Baṣrah.
Abū Saʾīd al-Khudrī رضي الله عنه (d. 74 AH): narrated 1,170 Aḥādīth.
ʿAlī ibn Abī Ṭālib رضي الله عنه (d. 40 AH): narrated 586 Aḥādīth. The Khalīfah of The Prophet ﷺ. He embraced Islām in the early days of Prophethood.
ʿUmar ibn al-Khaṭṭāb رضي الله عنه (d. 23 AH): narrated 539 Aḥādīth. The Khalīfah of The Prophet ﷺ. He embraced Islām in the early period of Makkah and was present at all of the battles.
Abū Umāmah al-Bāhlī رضي الله عنه (d. 81 or 86 AH): narrated 250 Aḥādīth. He was from the last of the Companions to pass away in ash-Shām.
Abū Qatādah al-Anṣārī رضي الله عنه (d. 40 or 54 AH): narrated 170 Aḥādīth.
ʿUthmān ibn ʿAffān رضي الله عنه (d. 35 AH): narrated 146 Aḥādīth. The Khalīfah of The Prophet ﷺ. He was known as Dhu an-Nūrayn and embraced Islām in the early days of Prophethood.
Ḥudhayfah ibn al-Yamān رضي الله عنه (d. 36 AH): narrated around 100 Aḥādīth. He was present at the battle of Uḥud.
Asmā’ bint Abū Bakr aṣ-Ṣiddīq رضي الله عنها (d. 73 AH): narrated 56 Aḥādīth. She embraced Islām in the early days and was the sister of ʿĀʾishah, the wife of The Prophet ﷺ.
Thawbān ضي الله عنه (d. 54 AH): narrated 27 Aḥādīth. He was regularly accompanying The Prophet ﷺ until he ﷺ passed away, then he went to ash-Shām and then Ḥimṣ.4
Abū Wāqid al-Laythī رضي الله عنه (d. 65 or 68 AH): narrated 24 Aḥādīth. He was present at the Battle of Badr, which is the most correct opinion.
Laqīṭ ibn Ṣabrah رضي الله عنه (d. ? AH): narrated 24 Aḥādīth.
Ṣafwān ibn ʿAssāl رضي الله عنه (d. around 40 AH): narrated 20 Aḥādīth. He took part in 12 battles with The Prophet ﷺ.
Ṭalq ibn ʿAlī رضي الله عنه (d. ? AH): narrated 14 Aḥādīth.
Salamah ibn al-Muḥabbaq رضي الله عنه (d. ? AH): narrated 12 Aḥādīth.
Abū as-Samh Iyād رضي الله عنه (d. ? AH): narrated 2 Aḥādīth.
May Allāh be pleased with them all.
All praise is due to Allāh, may His peace & blessings be upon our final Prophet Muḥammad, his family, his companions, & all those who follow him in guidance.
[Extracted from Tārīkh Ahl al-Ḥadīth (تاريخ أهل الحديث) by Shaykh Aḥmad ibn Muḥammad ad-Dehlawī رحمه الله]
 Ahl aṣ-Ṣuffah (أهل الصفة); the poor who lived next to The Prophet’s ﷺ Masjid.
 See Athar: Companions with the most Aḥādīth.
 Ṣaḥīḥ al-Bukhārī #6038, Ṣaḥīḥ Muslim #2309, Jāmiʿ at-Tirmidhī #2015, Sunan Abū Dāwūd #4774, al-Adab al-Mufrad #277, Riyāḍ aṣ-Ṣāliḥīn #621, ash-Shamā’il al-Muḥammadīyyah #344, Musnad Aḥmad #13419, aṭ-Ṭabaqāt al-Kubrá 7/17, Shuʿab al-ʾĪmān #8070, al-Aḥādīth al-Mukhtārah #1734.
 Ḥimṣ (حمص); city in Syria.
Ṣafīullāh Labīb ibn Salīm ʿAbd al-Malik
17th of Jumādá ath-Thānī 1444