Musannaf Ibn Abi Shaybah 27564 — A man writing to another man

Yunus said that a man wrote a letter from al-Hasan to Salih bin Abd al-Rahman, and he wrote thus: "In the name of Allah, the Most Gracious, the Most Merciful. From al-Hasan to Salih." Then the man said: "O Abu Sa'id, it would be good if you began with his name," so he began with that person's name.