He who appropriated the right of a Muslim by (swearing a false) oath, Allah would make Hell-fire necessary for him and would declare Paradise forbidden for him. A person said to him: Messenger of Allah, even if it is something insignificant? He (the Holy Prophet) replied: (Yes) even if it is the twig of the arak tree. (Using translation from Muslim 137a)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «مَنِ اقْتَطَعَ حَقَّ امْرِئٍ مُسْلِمٍ بِيَمِينِهِ فَقَدْ أَوْجَبَ اللهُ لَهُ النَّارَ وَحَرَّمَ عَلَيْهِ الْجَنَّةَ» فَقَالَ لَهُ رَجُلٌ وَإِنْ كَانَ شَيْئًا يَسِيرًا يَا رَسُولَ اللهِ؟ قَالَ «وَإِنْ كَانَ قَضِيبًا مِنْ أَرَاكٍ»  

“No man seizes the wealth of a Muslim unlawfully by means of his (false) oath, but Allah will deny Paradise to him and will doom him to Hell.” A man among the people said: “O Messenger of Allah, even if it is something small?” He said: “Even if it is a twig of an Arak tree.” (Using translation from Ibn Mājah 2324)  

أَنَّهُ سَمِعَ رَسُولَ اللهِ ﷺ يَقُولُ «لَا يَقْتَطِعُ رَجُلٌ حَقَّ امْرِئٍ مُسْلِمٍ بِيَمِينِهِ إِلَّا حَرَّمَ اللهُ عَلَيْهِ الْجَنَّةَ وَأَوْجَبَ لَهُ النَّارَ» فَقَالَ رَجُلٌ مِنَ الْقَوْمِ يَا رَسُولَ اللهِ وَإِنْ كَانَ شَيْئًا يَسِيرًا؟ قَالَ «وَإِنْ كَانَ سِوَاكًا مِنْ أَرَاكٍ»