Hadith 23541

وَبهِ وَبهِ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ إِذَا تَوَضَّأَ تَمَضْمَضَ ، وَمَسَحَ لِحْيَتَهُ مِنْ تَحْتِهَا بالْمَاءِ " .
And when the Prophet Muhammad (peace and blessings be upon him) performed ablution, he would rinse his mouth and wash his blessed beard from underneath with water.
Hadith Reference مسند احمد / مسند الأنصار رضي الله عنهم / 23541
Hadith Grading حکم دارالسلام: إسناده ضعيف جدا كسابقه