[Machine] The Messenger of Allah ﷺ said, "There is no vow in something that one does not possess, and cursing a believer is like killing him. Whoever kills himself with something in this world will be punished with it on the Day of Judgment, and whoever swears by a religion other than Islam falsely, he is as he said. And whoever says to a believer, 'O disbeliever,' it is as if he has killed him."
أَنَّ رَسُولَ اللهِ ﷺ قَالَ «لَا نَذْرَ فِيمَا لَا يَمْلِكُ وَلَعْنُ الْمُؤْمِنِ كَقَتْلِهِ وَمَنْ قَتَلَ نَفْسَهُ بِشَيْءٍ فِي الدُّنْيَا عُذِّبَ بِهِ يَوْمَ الْقِيَامَةِ وَمَنْ حَلَفَ بِمِلَّةٍ غَيْرِ الْإِسْلَامِ كَاذِبًا فَهُوَ كَمَا قَالَ وَمَنْ قَالَ لِمُؤْمِنٍ يَا كَافِرُ فَهُوَ كَقَتْلِهِ»