Jundub ben Junada ben Sufyan al-Ghifari known as Abu Dhar al-Ghifari was one of the greatest companions of Prophet Muhammad (s) and a companion of Imam 'Ali (a); he was also one of those who were known as the four pillars. He was a true companion of Prophet Muhammad (s) and Ahl al-Bayt (a). Numerous virtues and excellences have been narrated for him by both Sunni and Shi'a. Scholars of rijal have considered him as one the four pillars [among the companions]. Abu Dhar complained criticized actions of 'Uthman, the thirds Caliph, and as a result, he was exiled to Syria and then to al-Rabadha where he passed away.

At the beginning of Abu Bakr's Caliphate, Abu Dhar refused to pay Bay'a (oath of allegiance) to him, in order to support 'Ali b. Abi Talib (a).

In the time of , 'Umar, he refused to accept a total ban on narrating/writing hadith. In response Abu Dhar said: By Allah, if they threaten me by sword to stop narrating hadiths from Prophet Muhammad (s), I would rather die than stop narrating Prophet's hadith. That is why Abu Dhar and other narrators of hadith were imprisoned.

As Ibn Abi l-Hadid said, Abu Dhar was exiled to Syria because he complained to 'Uthman, about giving the treasury money to Marwan b. Hakam, Zayd b. Thabit and others as a gift. He said: "Abu Dhar was shouting in streets and complained to 'Uthman. As a result, 'Uthman exiled him to Syria".

However Abu Dhar made some social groups and informed people about the characteristics and virtues of Prophet Muhammad (s) and Ahl al-Bayt (a). On the other hand, Mu'awiya prohibited people from meeting Abu Dhar and reported his activities to 'Uthman. Therefore, he was returned to Medina.

Abu Dar met 'Uthman in Medina, where he refused his gift and criticized his actions again. Then 'Uthman lost his patience with him and exiled him to al-Rabadha in the worst possible condition, which is mentioned in many historical books.

Abu Dhar passed away in Dhu l-Hijja 32/653, in al-Rabadha, in the time of 'Uthman's caliphate. As Ibn Kathir said, no one was with him unless his wife and his child when he passed away Al-Zirikli said, when he passed away his family did not have anything for enshrouding his body. Mihran b. Maymun said: "All the property of Abu Dhar valued only about two dirhams [an old currency in Arab countries less valuable than dinar]".