Not graded
Sunan ad-Darimi 2878
حَدَّثَنَا أَبُو نُعَيْمٍ حَدَّثَنَا حَسَنٌ عَنْ أَبِيهِ عَنْ الشَّعْبِيِّ قَالَ حَدُّ الْمُكَاتَبِ حَدُّ الْمَمْلُوكِ حَتَّى يُعْتَقَ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 2878).