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'"
حَدَّثَنَا رَوْحُ بْنُ عَبْدِ الْمُؤْمِنِ، قَالَ: حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ هِشَامِ بْنِ عُرْوَةَ قَالَ: رَأَيْتُ رَسَائِلَ مِنْ رَسَائِلِ النَّبِيِّ صلى الله عليه وسلم، كُلَّمَا انْقَضَتْ قِصَّةٌ قَالَ: أَمَّا بَعْدُ.
Hisham ibn 'Urwa said, "I saw some of the letters of the Prophet,
may Allah bless him and grant him peace. After the introduction he said,
'Following on from that'"