The Messenger of Allah ﷺ said, "Whoever performs ablution should clear his nose, and whoever cleans himself after relieving himself should do so an odd number of times."
حدثنا عثمان أخبرنا يونس عن الزهري عن أبي إدريس
أن رسول الله ﷺ قال من توضأ فليستنثر ومن استنجى فليوتر
No references are available.
Its chain of transmission is sahih. It occurred previously in 7720, 2/401.