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.