Sahih al-Bukhari 6652
Sahih al-Bukhari · Book 83: Oaths and Vows · Whoever swears by a religion other than Islam
Narrated Thabit bin Ad-Dahhak:
حَدَّثَنَا مُعَلَّى بْنُ أَسَدٍ ، حَدَّثَنَا وُهَيْبٌ ، عَنْ أَيُّوبَ ، عَنْ أَبِي قِلاَبَةَ ، عَنْ ثَابِتِ بْنِ الضَّحَّاكِ ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم " مَنْ حَلَفَ بِغَيْرِ مِلَّةِ الإِسْلاَمِ فَهْوَ كَمَا قَالَ ـ قَالَ ـ وَمَنْ قَتَلَ نَفْسَهُ بِشَىْءٍ عُذِّبَ بِهِ فِي نَارِ جَهَنَّمَ، وَلَعْنُ الْمُؤْمِنِ كَقَتْلِهِ، وَمَنْ رَمَى مُؤْمِنًا بِكُفْرٍ فَهْوَ كَقَتْلِهِ " .
The Prophet (ﷺ) said, "Whoever swears by a religion other than Islam, is, as he says; and whoever commits suicide with something, will be punished with the same thing in the (Hell) Fire; and cursing a believer is like murdering him; and whoever accuses a believer of disbelief, then it is as if he had killed him."