"There is no vow and no oath concerning that which one does not possess, nor to commit sin, nor to sever the ties of kinship." (Using translation from Nasāʾī 3792)  

قَالَ رَسُولُ اللهِ ﷺ «لَا نَذْرَ وَلَا يَمِينَ فِيمَا لَا تَمْلِكُ وَلَا فِي مَعْصِيَةِ اللهِ وَلَا قَطِيعَةِ رَحِمٍ»