Sunan an-Nasa'i, Hadith 3771 ⓘ
Thabit bin Ad-Dahhak narrated that the Messenger of Allah said: "Whoever swears by a religion other than Islam, telling a lie, will be as he said, and whoever kills himself with something will be punished with it in the Hereafter."
أَخْبَرَنِي مَحْمُودُ بْنُ خَالِدٍ، قَالَ حَدَّثَنَا الْوَلِيدُ، قَالَ حَدَّثَنَا أَبُو عَمْرٍو، عَنْ يَحْيَى، أَنَّهُ حَدَّثَهُ قَالَ حَدَّثَنِي أَبُو قِلاَبَةَ، قَالَ حَدَّثَنِي ثَابِتُ بْنُ الضَّحَّاكِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " مَنْ حَلَفَ بِمِلَّةٍ سِوَى الإِسْلاَمِ كَاذِبًا فَهُوَ كَمَا قَالَ وَمَنْ قَتَلَ نَفْسَهُ بِشَىْءٍ عُذِّبَ بِهِ فِي الآخِرَةِ " .
also referenced under: Book 35, Hadith 11 (In-Book) & Volume 4, Book 35, Hadith 3802 (DarusSalam)