سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 89
The Book of Purification
The Command To Blow (Water From The Nose)
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا حَمَّادٌ، عَنْ مَنْصُورٍ، عَنْ هِلاَلِ بْنِ يِسَافٍ، عَنْ سَلَمَةَ بْنِ قَيْسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ إِذَا تَوَضَّأْتَ فَاسْتَنْثِرْ وَإِذَا اسْتَجْمَرْتَ فَأَوْتِرْ .
It was narrated from Salamah bin Qais that the Messenger of Allah (ﷺ) said: "When you perform Wudu', sniff water in your nose and blow it out, and when you use small stones (to remove filth), then make it off (numbered)."
Sunan an-Nasa'i, 89Sahih (Darussalam)