To Kumayl bin Ziyad Nakha'i, expressing his displeasure and rebuking him in leaving his province unguarded and allowing the army of the enemy to enter and carry on loot. He was the Governor of Hayit and had not properly defended the province against the Syrian guerrillas. After their attack and loot he wanted permission of Imam Ali (a) to take revenge upon the Syrian province of Kirkisiya. Imam Ali (a) replied to him in the following letter

To the Egyptians. The letter was handed over to Maalik bin Haarith Ashtar to take with him when he was appointed as the Governor of that province

To the Abdullah bin Qays, better known in history as Abu Musa Ash'ari, for his weak-faith and double-standards

A reply to Mu'awiya's letter

To Mu'awiya
To Abdullah b. Abbas. Ibn Abbas said that except the advice and sayings of the Holy Prophet (s) no other advice benefited him more than this
To Qutham b. Abbas (brother of Abdullah b. Abbas), who was the Governor of Makkah
To Salman al-Farsi, before his (Ali's) caliphate
To Harith Hamdani
To Suhayl b. Hunayf, the Governor of Madina (and brother of Uthman b. Hunayf) about some Madinites who had left him and gone over to Mu'awiya