Trusted Greatly by Hazrat Ali (ra)
Hazrat Abu Ayub Ansari (ra) was at the front of Hazrat Ali’s army during the Battles of Jamal, Siffin and Nahrawan.
(Ali Ibn al-Athir, Usd al-Ghabah fi Ma‘rifat al-Sahabah, Vol. 6, Hazrat Abu Ayub al-Ansari [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah, 2003], 22)
One can gauge the level of trust Hazrat Ali (ra) had in Hazrat Abu Ayub (ra) from the fact that when Hazrat Ali (ra) declared Kufa to be the Capital [of the Muslim empire] and moved there, he appointed Hazrat Abu Ayub Ansari (ra) as the Governor of Medina. He remained the governor of Medina until 40 AH when the Syrian army of Amir Muawiyah under the command of Busr bin Abi Artat invaded Medina. Owing to this, Hazrat Abu Ayub Ansari (ra) left Medina to be with Hazrat Ali (ra) in Kufa.
After the demise of the Holy Prophet (sa), the Companions of the Holy Prophet (sa) would be given a monthly stipend from the Khalifa. Initially Hazrat Abu Ayub’s stipend was 4,000, but during the Khilafat of Hazrat Ali (ra) it was increased to 20,000. Initially, eight workers were assigned to cultivate the land belonging to Hazrat Abu Ayub (ra), but Hazrat Ali (ra) increased this to 40.
(Muhammad Ibn Jarir al-Tabari, Tarikh al-Tabari, Vol. 3 [Beirut, Lebanon: Dar al-Kutub al-Ilmiyyah, 1987], 153) (Sheikh Shah Moinuddin Ahmad Nadvi, Siyar al-Sahabah, Vol. 3 [Karachi, Pakistan: Dar al-Isha‘ah, 2004], 112)