"Do not make vows, for a vow does not have any impact on the Qadar. Rather it is just a means of taking wealth from the miserly."  

أَنَّ النَّبِيَّ ﷺ قَالَ لاَ تَنْذِرُوا فَإِنَّ النَّذْرَ لاَ يُغْنِي مِنَ الْقَدَرِ شَيْئًا وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الْبَخِيلِ