Not graded
Sunan ad-Darimi 3071
حَدَّثَنَا عُبَيْدُ اللَّهِ عَنْ إِسْرَائِيلَ عَنْ مَنْصُورٍ عَنْ إِبْرَاهِيمَ قَالَ كَانَ السُّدُسُ أَحَبَّ إِلَيْهِمْ مِنْ الثُّلُثِ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 3071).