This is what Abu Huraira transmitted to us from Muhammad, the Messenger of Allah ﷺ, and he mentioned a number of a hadith, of which this is one: that the Messenger of Allah ﷺ said: When anyone amongst you (performs ablution) he must snuff his nostrils with water and then clean them.  

عَنْ مُحَمَّدٍ رَسُولِ اللَّهِ ﷺ فَذَكَرَ أَحَادِيثَ مِنْهَا وَقَالَ رَسُولُ اللَّهِ ﷺ إِذَا تَوَضَّأَ أَحَدُكُمْ فَلْيَسْتَنْشِقْ بِمَنْخِرَيْهِ مِنَ الْمَاءِ ثُمَّ لْيَنْتَثِرْ  

[Machine] The Messenger of Allah ﷺ said: "When one of you performs ablution, let him rinse his nose, and when he performs istijmar (cleansing with stones after using the bathroom), let him do it an odd number of times."  

قَالَ رَسُولُ اللهِ ﷺ إِذَا تَوَضَّأَ أَحَدُكُمْ فَلْيَسْتَنْثِرْ وَإِذَا اسْتَجْمَرَ فَلْيُوتِرْ  

[Machine] The Messenger of Allah ﷺ said, "When you perform ablution, one of you should insist on rinsing the mouth and when you take in the water through the nose, you should blow it out."  

قَالَ رَسُولُ اللهِ ﷺ إِذَا تَوَضَّأَ أَحَدُكُمْ فَلْيَسْتَنْثِرْ وَإِذَا اسْتَجْمَرَ فَلْيُوتِرْ  

[Machine] The Messenger of Allah ﷺ said, "When one of you performs ablution, let him inhale water through his nostrils and then exhale it."  

وَقَالَ رَسُولُ اللهِ ﷺ إِذَا تَوَضَّأَ أَحَدُكُمْ فَلْيَسْتَنْشِقْ بِمَنْخِرَيْهِ مِنَ الْمَاءِ ثُمَّ لِيَنْثُرْ  

When anyone wipes himself with pebbles (after answering the call of nature) he must make use of an odd number and when any one of you performs ablution he must snuff in his nose water and then clean it. (Using translation from Muslim 237a)   

"إذا تَوَضأ أحدُكُمْ فليَجْعَلْ في أنْفِه مَاءً ثُمَّ لينْتَثِرْ وإذا استْجَمْر فَليُوتِرْ".  

"إذَا تَوَضَّأ أحَدُكُمْ فَليَجعلْ في أنْفِه ماءً ثُمَّ ليَسْتَنْثِر، وإذا استنْثَرَ فليستنثِرْ وتْرًا".  

"إذَا توضَّأ أحدُكمْ فليَسْتنْثِر، وإذا اسْتَجْمر فلْيوتِرْ".