Missionary to Yemen
With regard to Hazrat Ali (ra) being sent to Yemen, it is mentioned in a narration that in 10 AH, the Holy Prophet (sa) sent Hazrat Ali (ra) to Yemen. Prior to this, the Holy Prophet (sa) sent Hazrat Khalid (ra) bin Walid towards the people of Yemen to invite them towards Islam, but they refused. Upon this, the Holy Prophet (sa) sent Hazrat Ali (ra). Hazrat Ali (ra) read the letter of the Holy Prophet (sa) before the people of Yemen as a result of which the entire residents of Hamadan accepted Islam in a single day. Hazrat Ali (ra) wrote a letter to the Holy Prophet (sa) informing him of their acceptance of Islam. Owing to this, the Holy Prophet (sa) recited three times: “May peace be upon the people of Hamadan.” Hamadan is situated in Yemen and is approximately 1,150 kilometres south east of Medina. After this, the people of Yemen accepted Islam. Hazrat Ali (ra) wrote to the Holy Prophet (sa) informing him about this, upon which he prostrated out of gratitude.
(Al-Kamil fi al-Tarikh, Vol. 2, p. 168, Dhikr Irsal Ali ila al-Yaman wa Islam Hamadan, Dar al-Kutub al-Ilmiyyah, Beirut, 2006) (Ghazwat wa Saraya az Allamah Muhammad Azhar Fareed Shah, p. 550, Fareed Publications Sahiwal, 2018)