"The Messenger of Allah forbade vows and said: 'They do not change anything; they are just a means of taking wealth from the miserly.'" (Using translation from Nasāʾī 3802)   

قَالَ رَسُولُ اللَّهِ «إِنَّ النَّذْرَ لَا يَرُدُّ شَيْئًا وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الْبَخِيلِ الشَّحِيحِ»