Ahmad al-Muhajir (, , ; 260-345 AH or c. 873-956 CE) also known as Al-Imām Aḥmad bin ʿĪsā was an Imam Mujtahid and the progenitor of Ba 'Alawi sada group which is instrumental in spreading Islam to India, Southeast Asia and Africa. He was the son of ‘Isa the son Muhammad the son of Ali al-Uraydi who was the fourth son of Imam Ja'far al-Sadiq, a fifth generation descendant of Ali and Fatima, the daughter of Muhammad. He was a known acquaintance of Bishr al-Ḥāfī.
Early life
His full name is Aḥmad al-Muhājir ibn ʿĪsā ar-Rūmī ibn Muḥammad an-Naqīb ibn ʿAlī al-ʿUrayḍī ibn Jaʿfar aṣ-Ṣādiq ibn Muḥammad al-Bāqir ibn ʿAlī Zayn al-ʿĀbidīn ibn al-Ḥusayn ibn ʿAlī ibn Abī Ṭālib. According to another history, he is thought to have been born in 241 Hijrah (854 CE)., but this seems to be weaker opinion.
Imam Aḥmad grew up under the supervision of his parents in an environment surrounded by scholars and living examples of prophetic character. He memorized the Qur'an and then mastered the sciences of the sacred law until he reached the rank mujtahid. He also had his own hadith collection (musnad, not to be confused with Musnad Ahmad) and was held in great esteem by the Sunni Imam Al-Tabari.
Migration
Al-Imam Aḥmad ibn Isa is called al-Muhâjir (emigrant) because he left Basra, Iraq during the Abbasid Caliphate that was headquartered in Baghdad in the year 317H (929 CE). His inner sight allowed him to witness the calamities and tribulations that would take place in Iraq. He realized the greatness of the sacred trust that he was carrying in his loins.
Aḥmad ibn Isa left Basra with his wife, his son, Abd Allah, (who preferred to be known as Ubayd Allah) and his grandson from Ubayd Allah (known as Basri). Basri's real name is Ismail but known as Basri as he was born in Basra. With them also was the ancestor of Sharif Muḥammad ibn Sulayman, the grandfather of the Ahdal family and Sharif Aḥmad al-Qudaymi, the grandfather of the Qudaymi family, and a group of 70 people. He left his other three sons Muḥammad, Ali and Husayn in Iraq to take care of their wealth and property.
He first went to Medina and Mecca, and then from Mecca to Yemen in around 319 H. He migrated at a time when there was much internal strife, bloodshed and confusion in Iraq, where a large number of the descendants of Muhammad were persecuted for political reasons by the ruling Abbasids and also because there was turmoil due to revolt against Abbasids ruling by members of the Qaramita.
He set out for Yemen in 319 H with his party and eventually reach Hadhramaut, while Aḥmad al-Qudaymi settled in northern Yemen and Sharif Muḥammad ibn Sulayman in Tihama on the Red Sea coast. He first settled in the village of Jubayl and then Hajrayn. Next he traveled to the village Qarat Bani Jushayr and finally settled in al-Husayyisah near Seiyun.
Later life and death
Imam al-Muhâjir arrived in Hadhramaut at a time when an offshoot of the Kharijite sect called Ibadiyyah held political power and had widespread influence throughout the valley. He persevered in the spreading of Islamic truths until he almost single-handedly removed the Ibadi sect from Hadhramaut without ever taking up arms against them.
He died in 345 H or 956 CE in al-Husaisah, a town between Tarim and Seiyun, Hadhramaut. His shrine stands on a hill and is among the first shrines that visitors to Hadhramaut pay their respects to when visiting the area.
School of thought
There is a controversy about what Madhhab followed by Aḥmad ibn ʻIsa. Most ulama (Islamic scholars) have the opinion that he was a Sunni imam. Some other ulama such as Imam ʻAbd al-Raḥman ibn ʻUbayd Allah al-Saqqāf, Habib Ṣalih al-Ḥamid, and Sayyid ʻAbd Allah ibn Ṭāhir al-Ḥaddād (brother of Habib Alwi bin Thahir al-Haddad, Mufti of Johor) and some others contend that he was a Shi'a Zaydi follower. However the majority of his descendants followed Sunni Islam.
Regarding what Madhab of law he followed, Habib Abd al-Rahman ibn Ubayd Allah al-Saqqaf emphasized that al-Muhâjir was not Sunni Shafi'i in fiqh (jurisprudence), as Imam Aḥmad ibn Isa is a Mujtahid, he does not need to follow any madhhabs.
Descendants and status
At first the term Alawi is given to all descendants of Ali ibn Abi Talib, both of his al-Hasan and al-Husayn. Later, to distinguish the descent of Alawi ibn Ubayd Allah, the title Aal Bani Alawi is then used.