(30) باب النَّذْرِ فِيمَا لاَ يُرَادُ بِهِ وَجْهُ اللَّهِ
It was narrated that Ibn 'Abbas said:
"The Messenger of Allah passed by a man who was leading another man by a rope. The Prophet took it, and cut it, and he said: 'It is a vow.'"
Reference: Sunan an-Nasa'i 3810
In-book reference: Book 35, Hadith 50
English translation: Vol. 4, Book 35, Hadith 3841