وَعَنْ عَبْدِ اَللَّهِ بْنِ عَمْرِوٍ رَضِيَ اَللَّهُ عَنْهُمَا
قَالَ: «جَاءَ أَعْرَابِيٌّ إِلَى اَلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: يَا رَسُولَ اَللَّهِ! مَا اَلْكَبَائِرُ?. … فَذَكَرَ اَلْحَدِيثَ، وَفِيهِ قُلْتُ: وَمَا اَلْيَمِينُ اَلْغَمُوسُ? قَالَ: «اَلَّذِي يَقْتَطِعُ مَالَ امْرِئٍ مُسْلِمٍ، هُوَ فِيهَا كَاذِبٌ»
A desert Arab came to the Prophet (sallallahu alayhi wa sallam) and said, “O Messenger of Allah, what are the major sins?” The narrator reported the Hadith and it contains: “The false oath.” It contains also: I asked, “What is the false oath?” The Prophet (sallallahu alayhi wa sallam) replied, “It is that (oath) by which one takes possession of the property of a Muslim person, while he is lying.”.
Bulugh al-Maram 1562, Book 13, Oaths and Vows, Hadith 7. 1 min read