Nafi' said, "Ibn 'Umar needed something from Mu'awiya and he wanted to write to him. People said, 'Begin with his name.' They kept on at him until he wrote, 'In the Name of Allah, the All-Merciful, Most Merciful, to Mu'awiya.'"
Reference: Al-Adab Al-Mufrad 1124 In-book : Book 45, Hadith 8 English translation : Book 45, Hadith 1124
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