Sahih Muslim Book - 1, Hadith - 303

حَدَّثَنِي أَبُو غَسَّانَ الْمِسْمَعِيُّ حَدَّثَنَا مُعَاذٌ وَهُوَ ابْنُ هِشَامٍ قَالَ حَدَّثَنِي أَبِي عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ قَالَ حَدَّثَنِي أَبُو قِلَابَةَ عَنْ ثَابِتِ بْنِ الضَّحَّاكِ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ لَيْسَ عَلَى رَجُلٍ نَذْرٌ فِيمَا لَا يَمْلِكُ وَلَعْنُ الْمُؤْمِنِ كَقَتْلِهِ وَمَنْ قَتَلَ نَفْسَهُ بِشَيْءٍ فِي الدُّنْيَا عُذِّبَ بِهِ يَوْمَ الْقِيَامَةِ وَمَنْ ادَّعَى دَعْوَى كَاذِبَةً لِيَتَكَثَّرَ بِهَا لَمْ يَزِدْهُ اللَّهُ إِلَّا قِلَّةً وَمَنْ حَلَفَ عَلَى يَمِينِ صَبْرٍ فَاجِرَةٍ.

It was narrated from Thabit bin Adh-Dhahhak that the Prophet (s.a.w) said: "No man is bound by a vow concerning something that he does not possess; and cursing a believer is like killing him; and whoever kills himself with something in this world will be punished with it on the Day of Resurrection; and whoever makes a false claim in order to appear to have more than he has, Allah will only cause him to have less; (and the same applies to) the one who is demanded and swears a false oath."