Musannaf Ibn Abi Shaybah 39396 — Reports on the letters of the Prophet

It is narrated from Yazid bin Abdullah bin al-Shikhkhir: We were sitting in this enclosure in Basrah when a Bedouin came, carrying a piece of leather or hide. The man said: "This is a letter which the Prophet (peace and blessings be upon him) wrote for me." The narrator said: I took the letter and read it out to the people. Written in it was: "In the name of Allah, the Most Gracious, the Most Merciful. From Muhammad, the Messenger of Allah (peace and blessings be upon him), to Banu Zuhayr bin Uqaysh. If you establish the prayer, pay the zakah, and give from the spoils of war the one-fifth, the share of the Prophet (peace and blessings be upon him) and the portion selected by the ruler, then you will have the protection of Allah and of His Messenger (peace and blessings be upon him)." The narrator asked: "Have you heard anything from the Messenger of Allah (peace and blessings be upon him)?" The Bedouin said: "I heard him say: 'Fasting the month of patience and three days of every month removes the whisperings of the chest.'"