"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." (Using translation from Nasāʾī 3805)
عَنِ النَّبِيِّ ﷺ قَالَ لَا تَنْذِرُوا فَإِنَّ النَّذْرَلَا يَرُدُّ شَيْئًا مِنَ الْقَدَرِ وَإِنَّمَا يُسْتَخْرَجُ بِهِ مِنَ الْبَخِيلِ