Commission in Najaf Ashraf
The late Allamah Amini traveled to Najaf Ashraf to continue higher studies (Darse Kharij) under the teachers of jurisprudence, principles, traditions and science of traditions. Therefore, he attended the classes of teachers of jurisprudence and its principles, like:
1. Ayatullah Sayyid Muhammad bin Muhammad Baqir Husaini Firozabadi (d. 1354 A.H.).
2. Ayatullah Sayyid Abu Turab bin Abul Qasim Khwansari (d. 1346 A.H.).
3. Ayatullah Mirza Ali bin Abdul Husain Erawani (d. 1354 A.H.).
4. Ayatullah Mirza Abul Hasan bin Abdul Husain Mishkini (d. 1358 A.H.).
Return to Tabriz
After a long stay in Najaf, during which he attended classes and held discussion with students, so that he may gain perfect knowledge and know-how, he returned to Tabriz, his hometown. There he became engrossed in teaching and further research. It was during this period that he began lessons on the exegesis of Surah Hamd.
To Najaf Ashraf again
The Shaykh did not stay in Tabriz for a long time. He was always in pursuit of advanced knowledge and his mind was always inclined to Najaf Ashraf. The holy city, which is the abode of knowledge and intellectuality. He was so much attracted to it that he returned to Najaf Ashraf once more, inspite of having a comfortable life and fame in Tabriz.
Permission for jurisprudence (Ijtehaad)
After returning to Najaf Ashraf, he continued his higher education in the Najaf Seminary and along with senior students, gained advanced knowledge in his chosen field. He was able to obtain the license to practice jurisprudence (Ijtehaad) from great scholars like:
1. Ayatullah Sayyid Mirza Ali bin Mujaddid Shirazi (d. 1355 A.H.).
2. Ayatullah Shaykh Mirza Husain Naini Najafi (d. 1355 A.H.).
3. Ayatullah Shaykh Abdul Karim bin Mulla Muhammad Ja’far Yazdi Haeri (d. 1355 A.H.).
4. Ayatullah Sayyid Abul Hasan bin Sayyid Muhammad Musawi Isfahani (d. 1365 A.H.).
5. Ayatullah Shaykh Muhammad Husain bin Muhammad Hasan Isfahani Najafi, famous as Kampani (d. 1361 A.H.).
6. Ayatullah Shaykh Muhammad Husain bin Ali Kashiful Ghita (d. 1373 A.H.).
He obtained permission from them to practice jurisprudence (Ijtehaad). Some senior scholars of Najaf also issued permission for him to narrate traditions; and in this way he joined the category of tradition narrators. From this we can conclude his caliber in reporting of traditions and traditional reports. Some of them are as follows:
1. Ayatullah Sayyid Abul Hasan Musawi Isfahani.
2. Ayatullah Sayyid Mirza Ali Husaini Shirazi.
3. Ayatullah Shaykh Ali Asghar Maliki Tabrizi