Al-Adab Al-Mufrad #1123
Letters
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا قَبِيصَةُ، قَالَ: حَدَّثَنَا سُفْيَانُ، عَنْ زَيْدِ بْنِ أَسْلَمَ قَالَ: أَرْسَلَنِي أَبِي إِلَى ابْنِ عُمَرَ، فَرَأَيْتُهُ يَكْتُبُ: بِسْمِ اللهِ الرَّحْمَنِ الرَّحِيمِ، أَمَّا بَعْدُ.
Zayd ibn Aslam said, "My father sent me to Ibn 'Umar and I saw
him write, 'In the Name of Allah, the All-Merciful, Most Merciful. Following
on from that'"
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About Al-Adab Al-Mufrad
This hadith is #1123 from Al-Adab Al-Mufrad, in the Book of Letters.