861/1124 (Authentic chain) From Nafi‘ who said: Ibn ‘Umar had a need with Mu‘awiya, so he wanted to write to him. They said: Begin with him! They kept insisting until he wrote: "(In the name of Allah, the Most Merciful, the Most Compassionate) to Mu‘awiya."

862/1125 (Authentic chain) From Anas ibn Sirin who said: I wrote to Ibn Umar, and he said: Write (In the name of Allah, the Most Gracious, the Most Merciful), as for what follows: to so-and-so." And in another narration from him he said: "A man wrote in the presence of Ibn Umar (In the name of Allah, the Most Gracious, the Most Merciful) to so-and-so, so Ibn Umar forbade him and said: 'Say: In the name of Allah, it is for him.'" (1).