Al-Adab Al-Mufrad, Book 45, Hadith 1126 (English)

Anas ibn Sirin said, "A man wrote in the presence of Ibn 'Umar, 'In the Name of Allah, the All-Merciful, Most Merciful, to so-and-so.' Ibn 'Umar forbade him and said, 'Say: 'In the Name of Allah. It is for Him.'"

وَعَنِ ابْنِ عَوْنٍ، عَنْ أَنَسِ بْنِ سِيرِينَ قَالَ‏:‏ كَتَبَ رَجُلٌ بَيْنَ يَدَيِ ابْنِ عُمَرَ‏:‏ بِسْمِ اللهِ الرَّحْمَنِ الرَّحِيمِ، لِفُلاَنٍ، فَنَهَاهُ ابْنُ عُمَرَ وَقَالَ‏:‏ قُلْ‏:‏ بِسْمِ اللهِ، هُوَ لَهُ‏.‏

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