Not graded
Companion’s words (mawquf) Sunan ad-Darimi 199
أَخْبَرَنَا أَبُو نُعَيْمٍ حَدَّثَنَا سُفْيَانُ عَنْ لَيْثٍ عَنْ مُجَاهِدٍ قَالَ قَالَ عُمَرُ إِيَّاكَ وَالْمُكَايَلَةَ يَعْنِي فِي الْكَلَامِ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 199).