" النَّذْرُ نَذْرَانِ فَمَا كَانَ مِنْ نَذْرٍ فِي طَاعَةِ اللَّهِ فَذَلِكَ لِلَّهِ وَفِيهِ الْوَفَاءُ وَمَا كَانَ مِنْ نَذْرٍ فِي مَعْصِيَةِ اللَّهِ فَذَلِكَ لِلشَّيْطَانِ وَلاَ وَفَاءَ فِيهِ وَيُكَفِّرُهُ مَا يُكَفِّرُ الْيَمِينَ "
It was narrated from Muhammad bin Az-Zubair, from his father, from a man from the inhabitants of Al-Basrah, who said: "I accompanied 'Imran bin Husain, who said: 'I heard the Messenger of Allah say: Vows are of two types: A vow that is made to do an act of obedience to Allah; that is for Allah and must be fulfilled, and a vow that is made to do an act of disobedience to Allah; that is for Shaitan and should not be fulfilled, and its expiation is the expiation for an oath.'"