All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
This narration [in question] is on Ibn Umar . Ibn Saalem Al-Muqaffa' said: "I saw Ibn Umar holding his beard and cutting what is beyond his fist." [Al-Bukhari, Ad-Daaraqutni, and Al-Haakim] Ad-Daaraqutni and Al-Albaani said that this is a sound narration, and Al-Haakim said that it is an authentic narration according to the conditions set by Al-Bukhari and Muslim .
Therefore, this narration does not descend less than the status of a sound narration.
Allaah Knows best.