Rinsing the mouth and sniffing up water into the nostrils with one handful of water
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا شَرِيكٌ، عَنْ خَالِدِ بْنِ عَلْقَمَةَ، عَنْ عَبْدِ خَيْرٍ، عَنْ عَلِيٍّ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ تَوَضَّأَ فَمَضْمَضَ ثَلاَثًا وَاسْتَنْشَقَ ثَلاَثًا مِنْ كَفٍّ وَاحِدٍ .
It was narrated from 'Ali that: The Messenger of Allah (ﷺ) performed ablution and he rinsed his mouth three times, and sniffed water up into his nose three times from one handful.