Thābit ibn Abī Ṣafiyya famously known as Abū Ḥamza al-Thumālī Thābit ibn Dīnār (Arabic: أبو حمزة الثمالي) was a close companion of Imam Ali al-Sajjad.

Abu Hamza al-Thumali was pious and righteous companion of Ali al-Sajjad. He was also a companion of Muhammad al-Baqir and Ja'far al-Sadiq. Al-Najashi said: “He was the best of our companions and the most reliable of them in narration and tradition.” It was reported on the authority of Ali al-Rida who said: “Abu Hamza at his time is like Salman at his time.” His supplication was accepted. His sons died martyrs with the great revolutionist, Zayd ibn Ali.^[1]

He died in the year 150 A.H.

• Kitab fi Tafsir al-Quran al-Karim (An exegesis of the Quran).
• Kitab al-Nawadir (A Book on the rare things).
• Kitab al-Zuhd (A Book on Asceticism).

Abu Hamza al-Thumali has related that during the month of Ramadhan, Ali Zayn al-Abidin used to spend a greater part of the night in prayers and when it used to be the time of beginning of the fast he recited a supplication which later known as Du'a Abi Hamzah al-Thumali (The supplication of Abi Hamzah al-Thumali). This supplication has been recorded in the book Misbah al-Mutahijjid of Shaykh Tusi.

• List of Shi'a Muslim scholars of Islam
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• List of Shia books