Muwatta Malik 33
Sahih Graded by Salim al-Hilali Book of Purity · Hadith 33 of 1,858وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا تَوَضَّأَ أَحَدُكُمْ فَلْيَجْعَلْ فِي أَنْفِهِ مَاءً ثُمَّ لِيَنْثِرْ وَمَنِ اسْتَجْمَرَ فَلْيُوتِرْ " .
Yahya related to me from Malik from Abu'zZinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "When you do wudu, snuff water into your nose and blow it out, and if you use stones to clean your private parts use an odd number
References
Muwatta Malik 33
In-book: Book 2, Hadith 2 Source: hadith-api (fawazahmed0)