Not graded
Sunan ad-Darimi 502
أَخْبَرَنَا عَمْرُو بْنُ عَوْنٍ أَخْبَرَنَا فُضَيْلٌ عَنْ عُبَيْدٍ الْمُكْتِبِ قَالَ رَأَيْتُهُمْ يَكْتُبُونَ التَّفْسِيرَ عِنْدَ مُجَاهِدٍ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 502).