´It was narrated that Abu Hurairah said:` "The Messenger of Allah said: 'Whoever performs ablution, let him clean his nose, and whoever uses pebbles to clean himself after defecating, let him use an odd number.'"
Hadith ReferenceSunan Ibn Majah / The Book of Purification and its Sunnah / Hadith: 409
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:بخاري ومسلم