Fayruz bin Daylami (r.a.)
Fayruz bin Daylami was among the Iranians that the ruler of Iran sent to Yemen to drive the Abyssinians away from Yemen. He became a Muslim in 10 H. He went to Madinah with a delegate to see the Messenger of Allah and to talk to him. He said, “O Messenger of Allah! You know where we come from. We became Muslims. Who are our friends and helpers?” The Prophet said, “Allah and His Messenger.” Fayruz and his friends said, “Allah and His Messenger are enough for us. We are pleased with them.”
Fayruz and his friends used to drink alcohol a lot before they became Muslims. When they found out that it was haram, they gave up drinking at once. However, something preoccupied his mind: Were grapes from which they made wine also haram? What were they going to do with the grapes they had? They asked the Prophet about it. He said, “Make raisins with the grapes you have.” They asked, “O Messenger of Allah! What shall we do with raisins?” Thereupon, the Prophet told them to make fruit stew and drink it.
Another problem of Fayruz was that he was married to two sisters. However, Islam rendered it haram. He asked the Prophet what to do about it. The Messenger of Allah (pbuh) said, “Keep the one you wish with you and divorce the other one.” Fayruz fulfilled this order at once. 
After staying in Madinah for a while, Fayruz and his friends returned to Yemen. They served Islam a lot there. When the Prophet was very ill, an imposter claimed to be a prophet emerged in Yemen. He killed this impostor called Aswadal-Ansi. Aswad was a magician. He put some evil spirits under his command. He deceived people by showing them some strange things. The Prophet sent orders to various places for the execution of Aswad. When he was killed by Fayruz and his friends, the Prophet told his Companions about it as good news: “Aswad al-Ansi, the impostor, was killed by one of your brothers last night. The Companions asked, “O Messenger of Allah! Who killed him?” He said, “A person from a righteous and blessed family, Fayruz ad-Daylami, killed him.” The Companions became very happy when this impostor, who was an enemy of Allah and His Messenger, was killed. They prayed for Fayruz.
Fayruz died in Yemen during the caliphate of Hz. Uthman.
May Allah be pleased with him!
Tabaqat, 5: 533-534; Musnad, 4: 232.