Not graded
Sunan ad-Darimi 461
أَخْبَرَنَا مَرْوَانُ بْنُ مُحَمَّدٍ قَالَ سَمِعْتُ سَعِيدَ بْنَ عَبْدِ الْعَزِيزِ يَقُولُ مَا كَتَبْتُ حَدِيثًا قَطُّ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 461).