وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَبِي إِدْرِيسَ الْخَوْلاَنِيِّ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ مَنْ تَوَضَّأَ فَلْيَسْتَنْثِرْ وَمَنِ اسْتَجْمَرَ فَلْيُوتِرْ ‏"‏ ‏.‏

Yahya related to me from Ibn Shihab from Abu Idris al-Khawlanifrom Abu Hurayra that the Messenger of Allah, may Allah bless him andgrant him peace, said, "The person doing wudu should snuff water uphis nose and blow it out again." Translation Not Available

Book Ref: Muwatta Imam Malik Book 2 Hadith 35
Web Ref:  Muwatta Imam Malik Book 2 Hadith 3