The Prophet ﷺ said: Snuff up water freely unless you are fasting.
قَالَ رَسُولُ اللَّهِ ﷺ بَالِغْ فِي الاِسْتِنْشَاقِ إِلاَّ أَنْ تَكُونَ صَائِمًا
"I said: 'O Messenger of Allah, tell me about Wudu." He said: 'Perform Wudu' well,[1] and exxagerate in sniffing water up into your nose, except when you are fasting.'" [1]See No. 141
قُلْتُ يَا رَسُولَ اللَّهِ أَخْبِرْنِي عَنِ الْوُضُوءِ قَالَ أَسْبِغِ الْوُضُوءَ وَبَالِغْ فِي الاِسْتِنْشَاقِ إِلاَّ أَنْ تَكُونَ صَائِمًا
"I said: 'O Messenger of Allah! Tell me about ablution.' He said: 'Perform ablution properly and sniff water up into your nostrils, thoroughly, unless you are fasting.'"
قُلْتُ يَا رَسُولَ اللَّهِ أَخْبِرْنِي عَنِ الْوُضُوءِ قَالَ أَسْبِغِ الْوُضُوءَ وَبَالِغْ فِي الاِسْتِنْشَاقِ إِلاَّ أَنْ تَكُونَ صَائِمًا
The Prophet ﷺ said: Snuff up water freely unless you are fasting. (Using translation from Abū Dāʾūd 2366)
قَالَ رَسُولُ اللهِ ﷺ إِذَا اسْتَنْشَقْتَ فَبَالِغْ إِلَّا أَنْ تَكُونَ صَائِمًا
"I said: 'O Messenger of Allah! Tell me about ablution.' He said: 'Perform ablution properly and sniff water up into your nostrils, thoroughly, unless you are fasting.'" (Using translation from Ibn Mājah 407)
قُلْتُ يَا رَسُولَ اللهِ أَخْبِرْنِي عَنِ الْوُضُوءِ قَالَ «أَسْبَغِ الْوُضُوءَ وَبَالِغْ فِي الِاسْتِنْشَاقِ إِلَّا أَنْ تَكُونَ صَائِمًا»
From his father who said: "I said. 'O Messenger of Allah! Inform me about Wudu.' So he said: "Perform Wudu well, and go between the fingers, and perform Istinshaq extensively except when fasting." (Using translation from Tirmidhī 788)
" أسْبِغْ الوضوءَ، وخلِّلْ بين الأصابعِ، وبالغْ في الاستنشاق إلا أن تكون صائمًا".