The Prophet ﷺ said: If anyone swears a false oath in confinement, he should make his seat in Hell on account of his (act).  

قَالَ النَّبِيُّ ﷺ مَنْ حَلَفَ عَلَى يَمِينٍ مَصْبُورَةٍ كَاذِبًا فَلْيَتَبَوَّأْ بِوَجْهِهِ مَقْعَدَهُ مِنَ النَّارِ