The Prophet ﷺ used to run water through his beard with his fingers.
حدثنا يحيى بن موسى حدثنا عبد الرزاق عن إسرائيل عن عامر بن شقيق عن أبي وائل
أن النبي ﷺ كان يخلل لحيته
No references are available.
[Its isnad is hasan]. Ibn Majah also reported it (see the two preceding hadiths), no. 430, from the hadith of Abdul-Razzaq through the same route, and it is found in Musannaf Abdul-Razzaq, no. 125. Ibn Khuzayma graded it sahih, no. 151, 152, 167, as did Ibn Hibban (al-Ihsan): 1078, Ibn Jarud, no. 72, and Hakim: 1/149.