It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) established brotherhood (mu'akhat) between Abu Talhah and Abu Ubaydah (may Allah be pleased with them both). This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs did not record it.

It is narrated from Ibn Ishaq, concerning those who took part in the Pledge of Aqabah, that among them was Mu'adh bin Jabal bin Amr bin Aws bin A'idh bin Adi bin Ka'b bin Ghanm bin Sa'd bin Ali bin Asad bin Saridah bin Tazid bin Jusham. He belonged to Banu Salimah. He took part in the Battle of Badr and in all the battles alongside the Messenger of Allah (peace and blessings be upon him). He passed away in the plague of Amwas in Syria during the caliphate of Sayyiduna Umar bin al-Khattab (may Allah be pleased with him). Banu Salimah attributed him to themselves because he had established brotherhood with one of their men.

Yahya bin Ma'in says that the kunyah of Sayyiduna Mu'adh bin Jabal (may Allah be pleased with him) is Abu Abd al-Rahman.

Imam Malik bin Anas says that Mu'adh bin Jabal (may Allah be pleased with him) passed away at the age of twenty-eight, and he will be (on the Day of Resurrection) ahead of all the scholars, in an elevated position.

It is narrated from Urwah that Mu'adh bin Jabal bin Amr bin A'idh bin Adi bin Ka'b bin Ghanm bin Udayy bin Sa'd bin Ali bin Asad bin Saridah bin Tazid bin Jusham (may Allah be pleased with him) took part in the Battle of Badr alongside the Messenger of Allah (peace and blessings be upon him).

Musa bin Uqbah says that Mu'adh bin Jabal bin Amr, who belonged to Banu Salimah bin al-Khazraj and whose kunyah was Abu Abd al-Rahman, passed away in the year 18 AH in the plague of Amwas at the age of thirty-eight.

Sa'id bin al-Musayyib says that Isa (peace be upon him) was raised (to the heavens) at the age of thirty-three, and Mu'adh bin Jabal (may Allah be pleased with him) also passed away at the age of thirty-three.

Yahya bin Sa'id al-Ansari says that Mu'adh bin Jabal (may Allah be pleased with him) passed away at the age of twenty-eight, whereas those who state a higher age for him have said thirty-two.

Imam Malik bin Anas says that Mu'adh bin Jabal (may Allah be pleased with him) passed away at the age of twenty-eight, and he will be (on the Day of Resurrection) a step ahead of the body of scholars.

Yahya bin Sa'id says that the soul of Mu'adh bin Jabal (may Allah be pleased with him) was taken at the age of thirty-three or thirty-four. Imam al-Hakim says that this statement of Yahya bin Sa'id is closer to being correct than the previous statements!