ذِكْرُ الزَّجْرِ عَنْ أَنْ يَحْلِفَ الْمَرْءُ بِسَائِرِ الْمِلَلِ سِوَى الْإِسْلَامِ
Verily the Messenger of Allah ﷺ said: He who took an oath on a religion other than Islam as a liar would become so as he said, and he who slaughtered himself with a thing would be slaughtered with that on the Day of Resurrection. (Using translation from Muslim 110d)
عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ حَلَفَ بِمِلَّةٍ سِوَى الْإِسْلَامِ كَاذِبًا مُتَعَمِّدًا فَهُوَ كَمَا قَالَ وَمَنْ قَتَلَ نَفْسَهُ بِشَيْءٍ عُذِّبَ بِهِ فِي نَارِ جَهَنَّمَ»