(13) باب ذِكْرِ الْعِلَّةِ الَّتِي مِنْ أَجْلِهَا نَهَى عَنِ الْخَلِيطَيْنِ وَهِيَ لِيَقْوَى أَحَدُهُمَا عَلَى صَاحِبِهِ
It was narrated that Abu Idris said:
"I saw Anas bin Malik when some Busr which had extra bits were brought to him, and he started to cut them off."
Reference: Sunan an-Nasa'i 5564
In-book reference: Book 51, Hadith 25
English translation: Vol. 6, Book 51, Hadith 5566